{"title":"Fosi Audio Integrated, Stereo, \u0026 Power Amps","description":"\u003cp style=\"text-align: center;\"\u003e\u003ca href=\"https:\/\/listenup.com\/pages\/fosi-audio\"\u003eFosi Audio\u003c\/a\u003e integrated, power, and stereo amplifiers deliver powerful, dynamic sound with exceptional clarity to bring your favorite music to life. \u003cbr\u003eCombining innovative technology, versatile connectivity, and compact designs, \u003cbr\u003eFosi Audio makes high-performance amplification accessible to every music lover.\u003c\/p\u003e","products":[{"product_id":"fosi-audio-za3-balanced-2-1-channel-power-amplifier","title":"Fosi Audio ZA3 Balanced 2.1-Channel Power Amplifier","description":"\u003ch3\u003eFosi Audio ZA3 Balanced 2.1-Channel Power Amplifier\u003c\/h3\u003e  \u003cp\u003eExperience powerful, high-fidelity sound with the Fosi Audio ZA3 Balanced 2.1-Channel Power Amplifier, a compact yet versatile Class-D amplifier designed for audiophiles looking to build or upgrade a stereo Hi-Fi system. Powered by the Texas Instruments TPA3255 amplifier chip, the ZA3 delivers 155 watts per channel into 4 ohms in stereo mode or 235 watts into 4 ohms in mono mode when paired with its included 48V\/5A power supply. With balanced XLR and 1\/4-inch TRS inputs, standard RCA connectivity, and a dedicated powered subwoofer output, the ZA3 combines impressive amplification performance with the flexibility to accommodate a wide range of audio systems.\u003c\/p\u003e  \u003cp\u003eDesigned with versatility in mind, the ZA3 features switchable stereo and mono operating modes, allowing it to power a pair of passive speakers or operate as a dedicated monoblock amplifier. For listeners looking to expand their system, two ZA3 amplifiers can be configured in mono mode to independently power the left and right speakers. The balanced XLR\/TRS combo inputs provide improved resistance to electrical interference and unwanted noise, making the ZA3 an excellent companion for compatible DACs, preamplifiers, and other high-quality audio components. A dedicated RCA subwoofer output also makes it easy to add a powered subwoofer for deeper bass and a more immersive 2.1-channel listening experience.\u003c\/p\u003e  \u003cp\u003eInside its compact aluminum alloy chassis, the ZA3 incorporates premium components, including Japanese NCC and ELNA capacitors, German WIMA capacitors, and Japanese Sumida inductors. Its carefully optimized circuitry delivers a signal-to-noise ratio of at least 106dB, total harmonic distortion below 0.006%, and a SINAD rating of 89dB for clean, detailed sound reproduction. Advanced heat management uses an enlarged chassis, side-mounted ventilation, and protective dust covers to maintain stable performance during extended listening sessions. Five replaceable DIP8 op-amp sockets also provide the opportunity to customize the amplifier's sound using compatible aftermarket operational amplifiers.\u003c\/p\u003e  \u003cp\u003eThe Fosi Audio ZA3 is equally focused on convenience and everyday usability. A 12V trigger input allows automatic power synchronization with compatible audio components, while a precision taper-A volume potentiometer provides smooth, controlled volume adjustments. Its one-piece aluminum alloy enclosure combines an understated modern appearance with durable construction, making it an excellent fit for desktop audio setups, compact listening rooms, and dedicated stereo systems. Whether you're powering bookshelf speakers, adding a subwoofer, or building a dual-mono Hi-Fi system, the ZA3 delivers flexible, high-performance amplification in a space-saving design.\u003c\/p\u003e  \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e ZA3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e ZA3-48V5A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Balanced Class-D stereo\/mono power amplifier\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eChannel Configuration:\u003c\/strong\u003e 2.0-channel amplification with powered subwoofer output for 2.1-channel systems\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Class:\u003c\/strong\u003e Class-D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Chip:\u003c\/strong\u003e Texas Instruments TPA3255\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOperating Modes:\u003c\/strong\u003e Stereo and PBTL mono\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eStereo Output Power with 48V\/5A Power Supply:\u003c\/strong\u003e 155 watts × 2 into 4 ohms RMS\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMono Output Power with 48V\/5A Power Supply:\u003c\/strong\u003e 235 watts × 1 into 4 ohms RMS\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eStereo Output Power with 32V\/5A Power Supply:\u003c\/strong\u003e 95 watts × 2 into 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMono Output Power with 32V\/5A Power Supply:\u003c\/strong\u003e 110 watts × 1 into 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Power Supply:\u003c\/strong\u003e 48V\/5A DC power adapter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported Input Voltage:\u003c\/strong\u003e DC 24–48V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported Speaker Impedance:\u003c\/strong\u003e 2–8 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 20Hz–20kHz (±0.1dB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise Ratio:\u003c\/strong\u003e At least 106dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDynamic Range:\u003c\/strong\u003e At least 106dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise and Distortion Ratio (SINAD):\u003c\/strong\u003e 89dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion (THD):\u003c\/strong\u003e Less than 0.006%\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNoise Floor:\u003c\/strong\u003e Approximately 150µV\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Sensitivity:\u003c\/strong\u003e 0.775V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced Audio Inputs:\u003c\/strong\u003e Stereo XLR\/1\/4-inch TRS combo connections\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUnbalanced Audio Input:\u003c\/strong\u003e Stereo RCA\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Outputs:\u003c\/strong\u003e Two pairs of binding-post terminals\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Wire Compatibility:\u003c\/strong\u003e Banana plugs and bare speaker wire\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSubwoofer Output:\u003c\/strong\u003e One RCA line-level output for a powered subwoofer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger:\u003c\/strong\u003e 3.5mm 12V trigger input for synchronized power operation\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Selection:\u003c\/strong\u003e Switchable RCA and balanced inputs\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Control:\u003c\/strong\u003e Taper-A potentiometer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Memory:\u003c\/strong\u003e Remembers the previous volume setting after powering off\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReplaceable Op-Amps:\u003c\/strong\u003e Five swappable DIP8 dual operational amplifier positions\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOp-Amp Locations:\u003c\/strong\u003e Left channel, right channel, balanced input, and subwoofer signal stages\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatible Op-Amp Examples:\u003c\/strong\u003e Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, LM4562, and other compatible DIP8 dual op-amps\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCapacitors:\u003c\/strong\u003e Japanese NCC, Japanese ELNA, and German WIMA components\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInductors:\u003c\/strong\u003e Japanese Sumida components\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCircuit Design:\u003c\/strong\u003e Optimized internal layout to minimize interference between audio circuitry sections\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling System:\u003c\/strong\u003e Side-mounted ventilation with protective dust covers and an enlarged heat-dissipating chassis\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eChassis Material:\u003c\/strong\u003e Aluminum alloy\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e One-piece molded enclosure with sandblasted exterior finish\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Approximately 6.1 × 7.2 × 2 inches (15.5 × 18.4 × 5.1cm)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eListed Weight:\u003c\/strong\u003e Approximately 3.92 lbs (1.78kg)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWi-Fi Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In DAC:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePhono Preamplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEAN:\u003c\/strong\u003e 6976136960270\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio ZA3 power amplifier, 48V\/5A power adapter, power cord, and user manual\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePowerful Class-D Stereo Amplification:\u003c\/strong\u003e The Texas Instruments TPA3255 amplifier chip delivers 155 watts per channel into 4 ohms with the included 48V\/5A power supply, providing substantial power for compatible passive bookshelf and floorstanding speakers.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eFlexible Stereo and Mono Operation:\u003c\/strong\u003e Switch between traditional two-channel stereo amplification and 235-watt mono operation, or pair two ZA3 amplifiers for a dedicated dual-mono Hi-Fi system.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eBalanced High-Fidelity Audio Connectivity:\u003c\/strong\u003e XLR and 1\/4-inch TRS combo inputs provide noise-resistant balanced connections for compatible DACs and preamplifiers, while standard RCA inputs offer straightforward integration with traditional audio sources.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eEasy 2.1-Channel System Expansion:\u003c\/strong\u003e A dedicated RCA subwoofer output allows the ZA3 to connect to a powered subwoofer, bringing additional low-frequency impact to music, movies, and everyday listening.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eCustomizable Audiophile Performance:\u003c\/strong\u003e Five replaceable DIP8 op-amp positions let enthusiasts experiment with compatible operational amplifiers to tailor the ZA3's sonic characteristics to their preferences.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePremium Components and Efficient Cooling:\u003c\/strong\u003e High-quality Japanese and German audio components, an optimized circuit layout, and upgraded side ventilation support clean, stable amplification in a compact aluminum chassis.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: How much power does the Fosi Audio ZA3 deliver?\u003c\/strong\u003e\u003cbr\u003e A: With the included 48V\/5A power supply, the Fosi Audio ZA3 delivers 155 watts per channel into 4 ohms in stereo mode or 235 watts into 4 ohms in mono mode. Output power varies depending on the connected speaker impedance, power supply, and operating configuration.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can the Fosi Audio ZA3 operate as a monoblock amplifier?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The ZA3 features a switchable mono mode that allows it to function as a dedicated monoblock power amplifier. Using two ZA3 units in mono mode allows each amplifier to power an individual speaker, creating a dual-mono stereo system with independent amplification for the left and right channels.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio ZA3 support balanced XLR connections?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The ZA3 includes balanced XLR\/1\/4-inch TRS combo inputs that help reduce unwanted interference and noise when connected to compatible balanced audio equipment. It also features standard RCA inputs for conventional unbalanced audio sources.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect a subwoofer to the Fosi Audio ZA3?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The ZA3 includes a dedicated RCA subwoofer line output for connecting a powered subwoofer. This allows you to expand a traditional stereo system into a 2.1-channel configuration with additional bass support. The output is designed for powered subwoofers and cannot directly drive a passive subwoofer.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What speakers are compatible with the Fosi Audio ZA3?\u003c\/strong\u003e\u003cbr\u003e A: The ZA3 supports passive speakers with nominal impedances from 2 to 8 ohms. It can be used with many bookshelf and floorstanding speakers, although overall performance depends on speaker sensitivity, impedance, listening volume, and room size. Speaker connections support banana plugs or bare speaker wire.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I change the op-amps in the Fosi Audio ZA3?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The ZA3 features five replaceable DIP8 dual op-amp positions, allowing enthusiasts to customize portions of the audio circuitry. Compatible alternatives include models such as the Sparkos SS3602, MUSES02, OPA2134PA, and LM4562. Always verify electrical compatibility, correct orientation, and safe installation procedures before replacing an op-amp.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio ZA3 have Bluetooth or a built-in DAC?\u003c\/strong\u003e\u003cbr\u003e A: No. The ZA3 is a dedicated analog power amplifier and does not include Bluetooth, Wi-Fi, or a built-in digital-to-analog converter. To stream digital music, connect a compatible external DAC, network streamer, or other source component with an appropriate analog output.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect a turntable to the Fosi Audio ZA3?\u003c\/strong\u003e\u003cbr\u003e A: Yes, but the turntable must have a built-in phono preamplifier or be connected through a separate external phono preamp. The ZA3 does not include a dedicated phono stage, so a turntable's raw phono-level signal must be converted to line level before connecting to the amplifier's RCA inputs.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887250100383,"sku":"FOS-ZA3-48-BLK","price":149.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/4696cbb5-d9cb-41df-a153-2f07f17e42e2.jpg?v=1791560627"},{"product_id":"fosi-audio-bt20a-max-bluetooth-2-1-channel-stereo-amplifier","title":"Fosi Audio BT20A MAX Bluetooth 2.1-Channel Stereo Amplifier","description":"\u003ch3\u003eFosi Audio BT20A MAX Bluetooth 2.1-Channel Stereo Amplifier\u003c\/h3\u003e  \u003cp\u003eBring powerful, high-fidelity sound to your home audio system with the Fosi Audio BT20A MAX Bluetooth 2.1-Channel Stereo Amplifier, a compact yet versatile Class-D amplifier designed for music enthusiasts who want exceptional sound quality, modern wireless connectivity, and flexible system integration. Powered by the Texas Instruments TPA3255 amplifier chip with advanced Post-Filter Feedback (PFFB) technology, the BT20A MAX delivers 180 watts RMS per channel into 4 ohms, with a maximum rated output of 300 watts per channel. Featuring Bluetooth 6.0 with LDAC and aptX Lossless support, dual RCA inputs, a dedicated subwoofer output, and an included remote control, the BT20A MAX combines powerful amplification with convenient everyday operation.\u003c\/p\u003e  \u003cp\u003eEngineered for clean, detailed sound reproduction, the BT20A MAX incorporates PFFB technology to minimize distortion and maintain consistent performance across a wide range of speaker loads. Its optimized circuitry features independent digital and analog power supply sections, helping reduce electrical interference and preserve musical detail. With a signal-to-noise ratio of at least 112dB, total harmonic distortion plus noise of 0.003% or less, and a SINAD rating of at least 96dB, the amplifier delivers excellent clarity, dynamic range, and precise stereo imaging. An enhanced cooling system with a built-in quiet fan improves cooling efficiency by approximately 30% compared with the BT20A Pro, supporting stable operation during extended listening sessions.\u003c\/p\u003e  \u003cp\u003eWireless streaming is equally impressive thanks to the integrated Qualcomm QCC3095 Bluetooth processor. Supporting Bluetooth 6.0 and premium audio codecs including LDAC, aptX Lossless, aptX HD, aptX Adaptive, aptX, AAC, and SBC, the BT20A MAX offers high-quality wireless playback from compatible smartphones, tablets, computers, and other Bluetooth devices. With support for audio resolutions up to 24-bit\/96kHz through compatible Bluetooth connections, listeners can enjoy detailed wireless music playback without the complexity of additional streaming components. Two stereo RCA inputs also provide convenient connections for external DACs, CD players, streamers, and turntables equipped with an appropriate phono preamplifier.\u003c\/p\u003e  \u003cp\u003eDesigned to serve as the centerpiece of a compact stereo or 2.1-channel system, the BT20A MAX includes a dedicated RCA subwoofer output for connecting a powered subwoofer. A switchable 80Hz high-pass filter lets your main speakers focus on frequencies above 80Hz while a connected subwoofer handles deeper bass, helping improve clarity and reduce unnecessary low-frequency demands on smaller speakers. Adjustable bass and treble controls allow you to personalize your listening experience, while a dedicated Bypass mode disables the tone adjustments for a more direct audio signal.\u003c\/p\u003e  \u003cp\u003eThe Fosi Audio BT20A MAX also offers thoughtful features that make everyday listening more convenient. Its motorized analog volume potentiometer provides smooth, precise volume adjustments from the front panel or the included infrared remote, which also controls power, input selection, Bluetooth playback, and other functions. A dedicated 12V trigger input enables synchronized power on\/off with compatible audio components, while its compact enclosure makes it an excellent fit for desktop systems, small listening rooms, and modern Hi-Fi setups. Whether you're upgrading a traditional stereo system, adding wireless streaming, or building a versatile 2.1-channel audio setup, the BT20A MAX delivers powerful performance in a convenient, space-saving design.\u003c\/p\u003e  \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e BT20A MAX\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Bluetooth stereo integrated amplifier with powered subwoofer output\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Class:\u003c\/strong\u003e Class-D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eChannel Configuration:\u003c\/strong\u003e 2.0 stereo \/ 2.1 with powered subwoofer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Chip:\u003c\/strong\u003e Texas Instruments TPA3255\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOperational Amplifier Chip:\u003c\/strong\u003e NE5532\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Technology:\u003c\/strong\u003e Post-Filter Feedback (PFFB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Rated Output Power:\u003c\/strong\u003e 300 watts × 2 at 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRMS Output Power:\u003c\/strong\u003e 180 watts × 2 at 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported Speaker Impedance:\u003c\/strong\u003e 2–8 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 20Hz–20kHz (±0.5dB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise Ratio:\u003c\/strong\u003e At least 112dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion + Noise:\u003c\/strong\u003e 0.003% or less\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSINAD:\u003c\/strong\u003e At least 96dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Supply Architecture:\u003c\/strong\u003e Independent digital and analog power supply sections\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Power Supply:\u003c\/strong\u003e 48V\/5A DC power adapter, standard version\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported DC Voltage Range:\u003c\/strong\u003e 32–48V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAnalog Audio Inputs:\u003c\/strong\u003e 2 stereo RCA input pairs (RCA1 and RCA2)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWireless Audio Input:\u003c\/strong\u003e Bluetooth\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Outputs:\u003c\/strong\u003e Left and right binding-post speaker terminals\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSubwoofer Output:\u003c\/strong\u003e 1 RCA line-level output for a powered subwoofer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger:\u003c\/strong\u003e 1 trigger input for synchronized power control\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Version:\u003c\/strong\u003e 6.0\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Processor:\u003c\/strong\u003e Qualcomm QCC3095\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Device Name:\u003c\/strong\u003e Fosi Audio BT20A MAX\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Audio Codecs:\u003c\/strong\u003e SBC, AAC, aptX, aptX HD, aptX Adaptive, aptX Lossless, and LDAC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Bluetooth Audio Resolution:\u003c\/strong\u003e Up to 24-bit\/96kHz PCM with compatible sources and codecs\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Wireless Range:\u003c\/strong\u003e Up to 15 meters (approximately 50 feet) under suitable conditions\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Selection:\u003c\/strong\u003e Dedicated front-panel power\/input selection button\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Indicators:\u003c\/strong\u003e LEDs for Bluetooth, RCA1, and RCA2\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Control:\u003c\/strong\u003e Motorized analog potentiometer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTone Controls:\u003c\/strong\u003e Independent bass and treble adjustment\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTone Bypass:\u003c\/strong\u003e Dedicated rear-panel Tone\/Bypass switch\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-Pass Filter:\u003c\/strong\u003e Switchable 80Hz HPF for main speaker outputs\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-Pass Filter Control:\u003c\/strong\u003e Rear-panel on\/off switch\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Control:\u003c\/strong\u003e Included infrared remote\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Functions:\u003c\/strong\u003e Power on\/off, mute, volume adjustment, input selection, Bluetooth reset, and Bluetooth playback controls\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Battery Requirement:\u003c\/strong\u003e 2 AAA batteries, not included\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Function:\u003c\/strong\u003e Automatically powers the amplifier on\/off with a compatible component providing a 12V trigger signal\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling System:\u003c\/strong\u003e Integrated quiet fan and optimized chassis ventilation\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling Efficiency:\u003c\/strong\u003e Approximately 30% improved cooling efficiency compared with the BT20A Pro\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRecommended Speaker Type:\u003c\/strong\u003e Passive bookshelf or floorstanding speakers\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSubwoofer Compatibility:\u003c\/strong\u003e Powered subwoofers with compatible RCA line-level inputs\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Antenna:\u003c\/strong\u003e External detachable antenna\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWi-Fi Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHDMI Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOptical\/Coaxial Digital Inputs:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Phono Preamplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadphone Output:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio BT20A MAX amplifier, Bluetooth antenna, infrared remote control, 48V\/5A power adapter, and user manual\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePowerful Class-D Stereo Amplification:\u003c\/strong\u003e The Texas Instruments TPA3255 amplifier delivers 180 watts RMS per channel into 4 ohms, providing substantial power for compatible passive bookshelf and floorstanding speakers.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eHigh-Resolution Bluetooth 6.0 Streaming:\u003c\/strong\u003e The Qualcomm QCC3095 processor supports LDAC, aptX Lossless, aptX HD, aptX Adaptive, and other Bluetooth codecs for high-quality wireless music playback from compatible devices.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eClean, Detailed Audio with PFFB Technology:\u003c\/strong\u003e Post-Filter Feedback circuitry, independent power supply sections, and a signal-to-noise ratio of at least 112dB help deliver precise stereo imaging, low distortion, and excellent musical clarity.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eVersatile 2.1-Channel System Integration:\u003c\/strong\u003e Dual RCA inputs, a dedicated powered subwoofer output, and a switchable 80Hz high-pass filter make it easy to build a complete stereo system with deeper bass and improved speaker performance.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eConvenient Remote and Audio Controls:\u003c\/strong\u003e A motorized analog volume control, included infrared remote, independent bass and treble adjustments, and Tone Bypass mode provide convenient control over your listening experience.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eReliable Performance and Smart Power Management:\u003c\/strong\u003e An enhanced cooling system and 12V trigger input help maintain stable amplification while making the BT20A MAX easy to integrate with other compatible Hi-Fi components.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: How much power does the Fosi Audio BT20A MAX deliver?\u003c\/strong\u003e\u003cbr\u003e A: The Fosi Audio BT20A MAX is rated to deliver 180 watts RMS per channel into 4 ohms, with a maximum advertised output of 300 watts per channel into 4 ohms. Powered by the Texas Instruments TPA3255 Class-D amplifier chip, it provides substantial amplification for compatible passive speakers. Actual output depends on speaker impedance, power supply, and listening conditions.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio BT20A MAX support Bluetooth streaming?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The BT20A MAX features Bluetooth 6.0 powered by the Qualcomm QCC3095 processor. It supports SBC, AAC, aptX, aptX HD, aptX Adaptive, aptX Lossless, and LDAC codecs, with audio resolutions up to 24-bit\/96kHz when paired with compatible Bluetooth sources and codecs.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect a subwoofer to the Fosi Audio BT20A MAX?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The BT20A MAX features a dedicated RCA subwoofer output for connecting a powered subwoofer. It also includes a switchable 80Hz high-pass filter that reduces low-frequency output to the main speakers, allowing them to focus on midrange and higher frequencies while the subwoofer provides deeper bass. The subwoofer output cannot directly power a passive subwoofer.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio BT20A MAX have a 12V trigger?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The BT20A MAX includes a dedicated 12V trigger input that enables synchronized power on\/off with a compatible preamplifier, DAC, streamer, or other component equipped with a 12V trigger output.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What audio inputs are available on the Fosi Audio BT20A MAX?\u003c\/strong\u003e\u003cbr\u003e A: The BT20A MAX includes two stereo RCA analog input pairs and Bluetooth wireless connectivity. The RCA connections can accommodate compatible CD players, DACs, streamers, and other line-level sources, while Bluetooth provides wireless audio streaming from smartphones, tablets, and computers. Only one input source can be selected at a time.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I adjust the bass and treble on the Fosi Audio BT20A MAX?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The BT20A MAX includes independent bass and treble controls for adjusting the sound to your preferences. A rear-panel Tone\/Bypass switch lets you disable these adjustments when you prefer a more direct audio signal without the amplifier's internal tone processing.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio BT20A MAX include a remote control?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The BT20A MAX includes an infrared remote that controls power, volume, mute, input selection, and Bluetooth playback functions. Its motorized analog volume knob physically adjusts when volume changes are made using the remote. The remote requires two AAA batteries, which are not included.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect a turntable to the Fosi Audio BT20A MAX?\u003c\/strong\u003e\u003cbr\u003e A: Yes. A turntable can connect to either RCA input, provided it has a built-in phono preamplifier or is connected through an external phono preamp. The BT20A MAX does not include a dedicated phono stage, so a turntable's phono-level signal must be converted to line level before playback.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887252328607,"sku":"FOS-BT20AMAX-BLK","price":249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/720a6638-0346-4917-a2c7-2c1aad82f77b.jpg?v=1791561327"},{"product_id":"fosi-audio-psu20-3-channel-40w-linear-power-supply","title":"Fosi Audio PSU20 3-Channel 40W Linear Power Supply","description":"\u003ch3\u003eFosi Audio PSU20 3-Channel 40W Linear Power Supply\u003c\/h3\u003e  \u003cp\u003eUpgrade your Hi-Fi system with the Fosi Audio PSU20 3-Channel 40W Linear Power Supply, a premium power solution designed to deliver clean, stable, and reliable electricity to your favorite audio components. Featuring a custom 80W pure-copper toroidal transformer, three fully isolated power output channels, and ultra-low ripple noise as low as 0.1mV, the PSU20 provides a refined alternative to conventional switching power adapters. With two selectable DC outputs and one USB-A power output, the PSU20 can power up to three compatible devices simultaneously, making it an excellent addition to systems built around DACs, headphone amplifiers, CD transports, and stereo preamplifiers.\u003c\/p\u003e  \u003cp\u003eDesigned to minimize electrical interference and preserve audio system performance, the PSU20 uses a carefully engineered linear power architecture with independent rectification, filtering, voltage regulation, and protection circuits for each output channel. Unlike conventional switching power supplies, which rely on high-frequency switching circuits, the PSU20 uses linear regulation to provide a stable DC output with a controlled noise profile. Premium Nippon Chemi-Con capacitors help reduce unwanted voltage fluctuations and electrical ripple, while a high-performance rectifier and dedicated voltage regulators support clean, consistent power delivery. This approach can help reduce power-related interference in compatible audio equipment, particularly sensitive low-noise components.\u003c\/p\u003e  \u003cp\u003eFlexibility is one of the PSU20's greatest advantages. Its first DC output provides selectable 12V or 15V power with a maximum rated output of 20 watts, while the second DC output offers selectable 5V or 12V power with a maximum rating of 15 watts. A dedicated USB-A connection supplies 5V\/1A power for compatible USB-powered devices. Together, these three independently isolated outputs deliver a combined rated capacity of 40 watts, allowing listeners to replace multiple individual power adapters with one centralized power solution. The included DC-to-DC power cables help reduce cable clutter while creating a cleaner, more organized audio system.\u003c\/p\u003e  \u003cp\u003eInside the PSU20 is a custom pure-copper toroidal transformer rated at 80 watts with a peak capability of up to 100 watts, providing the foundation for stable power conversion and regulation. Its GBU806 rectifier bridge is rated for 600V and 8A, while three LM1085IT regulators and one ST78M05 regulator provide carefully controlled voltage delivery. Each output channel operates through dedicated regulation and protection circuitry to help prevent electrical interaction between connected components. With ripple levels as low as 0.1mV, the PSU20 is engineered to support sensitive audio electronics that benefit from consistent, low-noise power.\u003c\/p\u003e  \u003cp\u003eFor reliable long-term operation, the PSU20 incorporates automatic thermal management and multiple electrical protection systems. A custom low-noise cooling fan activates when the internal temperature reaches approximately 55°C (131°F), operating at a rated noise level of just 30dB. Built-in over-temperature, overvoltage, and overcurrent protection help safeguard the power supply and compatible connected equipment. Its durable desktop enclosure and unified component styling allow it to integrate naturally into modern Hi-Fi systems. Whether you're powering a dedicated headphone listening station, a desktop DAC and preamplifier combination, or multiple compatible low-voltage audio components, the Fosi Audio PSU20 delivers a convenient, organized, and performance-focused power solution.\u003c\/p\u003e  \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e PSU20\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e 3-channel linear DC power supply\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Supply Design:\u003c\/strong\u003e Linear regulated power supply\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Output Channels:\u003c\/strong\u003e 3 fully isolated channels\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Connected Devices:\u003c\/strong\u003e 3 compatible devices simultaneously\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Rated Output Power:\u003c\/strong\u003e 40 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTransformer:\u003c\/strong\u003e Custom pure-copper toroidal transformer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTransformer Rating:\u003c\/strong\u003e 80 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTransformer Peak Power:\u003c\/strong\u003e Up to 100 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAC Power Input:\u003c\/strong\u003e 1 × AC mains power connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAC Voltage Selection:\u003c\/strong\u003e Manual 115V\/230V selection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e115V Setting:\u003c\/strong\u003e Supports 100–120V AC, 60Hz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e230V Setting:\u003c\/strong\u003e Supports 220–240V AC, 50Hz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Power Outputs:\u003c\/strong\u003e 2 DC barrel-style power connections\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB Power Output:\u003c\/strong\u003e 1 USB-A connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Output 1 Voltage:\u003c\/strong\u003e Selectable 12V or 15V DC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Output 1 Rated Power:\u003c\/strong\u003e 20 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Output 2 Voltage:\u003c\/strong\u003e Selectable 5V or 12V DC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Output 2 Rated Power:\u003c\/strong\u003e 15 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB-A Output Voltage:\u003c\/strong\u003e 5V DC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB-A Output Current:\u003c\/strong\u003e 1A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB-A Output Rated Power:\u003c\/strong\u003e 5 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported Output Voltages:\u003c\/strong\u003e 5V, 12V, and 15V DC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOutput Isolation:\u003c\/strong\u003e Independent rectification, filtering, regulation, and protection for each channel\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Regulation:\u003c\/strong\u003e Four linear regulator components\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLinear Regulators:\u003c\/strong\u003e 3 × LM1085IT and 1 × ST78M05\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRectifier Bridge:\u003c\/strong\u003e GBU806\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRectifier Voltage Rating:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRectifier Current Rating:\u003c\/strong\u003e 8A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCapacitors:\u003c\/strong\u003e Premium Nippon Chemi-Con capacitors\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOutput Ripple:\u003c\/strong\u003e As low as 0.1mV\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling System:\u003c\/strong\u003e Automatic temperature-controlled cooling fan\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling Fan Activation Temperature:\u003c\/strong\u003e 55°C (131°F)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling Fan Noise Level:\u003c\/strong\u003e Approximately 30dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOver-Temperature Protection:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOvervoltage Protection:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOvercurrent Protection:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range:\u003c\/strong\u003e -20°C to 40°C (-4°F to 104°F)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFull-Load Temperature Rise:\u003c\/strong\u003e Approximately 25°C (77°F)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatible Equipment:\u003c\/strong\u003e Devices requiring supported DC voltages, power levels, polarity, and connectors\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRecommended Applications:\u003c\/strong\u003e Compatible DACs, CD transports, headphone amplifiers, preamplifiers, and low-voltage audio accessories\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Distribution:\u003c\/strong\u003e Three independent output channels with a combined 40W rating\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Cable Length 1:\u003c\/strong\u003e 1.2 meters (47.2 inches)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Cable Length 2:\u003c\/strong\u003e 0.3 meters (11.8 inches)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e CE, FCC, and RoHS\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEAN:\u003c\/strong\u003e 6976136961482\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAnalog Audio Inputs:\u003c\/strong\u003e None\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDigital Audio Inputs:\u003c\/strong\u003e None\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Outputs:\u003c\/strong\u003e None; all three outputs provide electrical power only\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger:\u003c\/strong\u003e No dedicated 12V trigger connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Audio Amplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWi-Fi Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio PSU20 Linear Power Supply, 1.2m DC-to-DC power cable, 0.3m DC-to-DC power cable, AC power cord, and user manual\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eClean, Low-Noise Power Delivery:\u003c\/strong\u003e Linear regulation, premium capacitors, and ripple noise as low as 0.1mV help reduce unwanted power-supply interference in compatible Hi-Fi equipment.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePowering Three Components Simultaneously:\u003c\/strong\u003e Two DC outputs and one USB-A connection provide a combined 40 watts of rated power for compatible DACs, headphone amplifiers, CD transports, preamplifiers, and audio accessories.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eFully Isolated Power Channels:\u003c\/strong\u003e Independent rectification, filtering, regulation, and protection circuitry for each output helps minimize electrical interaction between connected components.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eFlexible Voltage Selection:\u003c\/strong\u003e Selectable 5V, 12V, and 15V DC output options accommodate a wide range of supported low-voltage audio devices.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePremium Power Supply Components:\u003c\/strong\u003e An 80W pure-copper toroidal transformer, Nippon Chemi-Con capacitors, a GBU806 rectifier, and dedicated linear regulators provide a robust foundation for consistent power delivery.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eReliable, Quiet Operation:\u003c\/strong\u003e An automatic 30dB cooling fan and built-in over-temperature, overvoltage, and overcurrent protection support stable operation during extended listening sessions.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is the Fosi Audio PSU20 used for?\u003c\/strong\u003e\u003cbr\u003e A: The Fosi Audio PSU20 is a 3-channel linear power supply designed to deliver clean, stable DC power to compatible audio components. It can replace multiple individual power adapters while supplying electricity to devices such as DACs, headphone amplifiers, CD transports, and stereo preamplifiers. It is not an audio amplifier or signal-processing device.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: How many devices can the Fosi Audio PSU20 power simultaneously?\u003c\/strong\u003e\u003cbr\u003e A: The PSU20 can power up to three compatible devices at the same time. It features two DC barrel outputs and one USB-A power output, providing a combined rated output of 40 watts. The connected devices must remain within the voltage and power limits of their respective outputs.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What power outputs does the Fosi Audio PSU20 have?\u003c\/strong\u003e\u003cbr\u003e A: The PSU20 provides three isolated outputs. DC Output 1 offers selectable 12V or 15V power with a maximum rating of 20 watts, DC Output 2 offers selectable 5V or 12V power rated at 15 watts, and the USB-A output provides 5V\/1A power rated at 5 watts. All three outputs are dedicated to supplying electrical power rather than carrying audio signals.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is the benefit of a linear power supply for Hi-Fi audio?\u003c\/strong\u003e\u003cbr\u003e A: A linear power supply uses transformer-based power conversion and linear voltage regulation to provide stable DC power with a controlled noise profile. The PSU20 offers ripple levels as low as 0.1mV, which may help reduce power-related interference in sensitive audio equipment. The degree of audible improvement depends on the connected components and their internal power regulation.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I use the Fosi Audio PSU20 with any DAC or headphone amplifier?\u003c\/strong\u003e\u003cbr\u003e A: The PSU20 works with compatible audio equipment that meets its voltage, current, power, connector, and polarity requirements. Before connecting a device, verify that it operates at the selected output voltage and that its power consumption does not exceed the rating of the chosen PSU20 output. Devices requiring higher power levels or different electrical specifications should not be connected.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio PSU20 have a cooling fan?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The PSU20 includes a temperature-controlled cooling fan that automatically activates when its internal temperature reaches approximately 55°C (131°F). The fan operates at a rated noise level of approximately 30dB and helps maintain stable performance during extended use.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio PSU20 include electrical protection features?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The PSU20 includes over-temperature, overvoltage, and overcurrent protection to help safeguard the power supply and connected audio equipment. Each of its three output channels incorporates dedicated regulation and protection circuitry for stable, isolated power delivery.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio PSU20 have audio inputs, outputs, or a 12V trigger?\u003c\/strong\u003e\u003cbr\u003e A: No. The PSU20 is a dedicated electrical power supply and does not include analog or digital audio connections or a dedicated 12V trigger. It features one AC mains input and three DC power outputs: two barrel-style DC outputs and one USB-A power output. Its 12V settings supply continuous DC power rather than trigger-control signals.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887255408799,"sku":"FOS-PSU20-BLK","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/4dd47364-0ad1-4112-8e37-5012882bf5fa.jpg?v=1791563867"},{"product_id":"fosi-audio-zp3-balanced-stereo-preamplifier","title":"Fosi Audio ZP3 Balanced Stereo Preamplifier","description":"\u003ch3\u003eFosi Audio ZP3 Balanced Stereo Preamplifier\u003c\/h3\u003e  \u003cp\u003eTake control of your home audio system with the Fosi Audio ZP3 Balanced Stereo Preamplifier, a versatile Hi-Fi component designed to bring multiple audio sources, precise volume control, and flexible system connectivity together in one compact device. Featuring a balanced audio architecture, three selectable analog inputs, and dedicated RCA, XLR, and subwoofer outputs, the ZP3 serves as the control center for a high-performance stereo system. With premium audio components, adjustable bass and treble, a three-position high-pass filter, and convenient remote operation, the ZP3 makes it easy to customize your listening experience while preserving the clarity and dynamics of your favorite music.\u003c\/p\u003e  \u003cp\u003eDesigned for listeners who want greater control over their audio systems, the ZP3 features two stereo RCA inputs and one balanced stereo XLR input, allowing you to connect multiple source components such as external DACs, CD players, music streamers, and phono preamplifiers. Balanced XLR and unbalanced RCA outputs provide flexible connections to compatible power amplifiers and powered speakers, while a dedicated subwoofer output allows easy integration of a powered subwoofer for deeper, more impactful bass. The ZP3 also supports conversion between balanced and unbalanced analog signals, making it easier to combine components with different connection types without relying on additional converters.\u003c\/p\u003e  \u003cp\u003eAt the heart of the Fosi Audio ZP3 is an optimized preamplifier circuit incorporating premium ELNA capacitors, an NJR NJU72315 electronic volume control IC, and gold-plated RCA connections. These components help minimize distortion and unwanted noise while preserving musical detail and precise stereo imaging. The balanced XLR output achieves a signal-to-noise ratio of at least 112dB and total harmonic distortion plus noise of 0.0007% or less, while the RCA output delivers a signal-to-noise ratio of at least 115dB with distortion of 0.0008% or less. With a manufacturer-rated SINAD of at least 113dB and channel crosstalk of -130dB or lower, the ZP3 provides a clean, controlled foundation for high-fidelity music reproduction.\u003c\/p\u003e  \u003cp\u003eFor additional flexibility, the ZP3 features independent bass, treble, and left\/right balance adjustments, giving you control over the tonal character and stereo balance of your system. Bass can be adjusted by ±12dB, while treble can be adjusted by ±6dB, allowing you to fine-tune playback for different recordings, speakers, and listening preferences. A dedicated Bypass switch removes the bass and treble adjustment circuitry from the signal path when you prefer a more direct listening experience. The ZP3 also incorporates a three-position high-pass filter with full-range, 80Hz, and 120Hz settings, allowing you to reduce low-frequency output to your main speakers when using a powered subwoofer. This makes it particularly useful for compact bookshelf speaker systems and 2.1-channel Hi-Fi setups.\u003c\/p\u003e  \u003cp\u003eConvenience is another key part of the ZP3's design. Its precision electronic volume control remembers individual volume settings for each input, reducing the need for repeated adjustments when switching between sources with different output levels. Front-panel controls provide direct access to input selection, volume, bass, treble, and stereo balance, while the included infrared remote handles power, mute, volume, and source selection from your listening position. Dedicated 12V trigger input and output connections allow the ZP3 to synchronize power with compatible audio components, including the Fosi Audio ZD3 DAC and ZA3 power amplifier. With its compact desktop-friendly enclosure, premium components, and flexible analog connectivity, the Fosi Audio ZP3 is an excellent choice for building or expanding a dedicated stereo or 2.1-channel Hi-Fi system.\u003c\/p\u003e  \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e ZP3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Balanced stereo preamplifier\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Channels:\u003c\/strong\u003e 2.0-channel stereo with dedicated subwoofer line output\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported System Configuration:\u003c\/strong\u003e Stereo or 2.1-channel with a powered subwoofer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePreamplifier Architecture:\u003c\/strong\u003e Balanced analog signal architecture\u003c\/li\u003e 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\u003cli\u003e\n\u003cstrong\u003eRCA and XLR Output Operation:\u003c\/strong\u003e Both outputs operate simultaneously and cannot be independently selected\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Input:\u003c\/strong\u003e 1 × 3.5mm connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Output:\u003c\/strong\u003e 1 × 3.5mm connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Function:\u003c\/strong\u003e Synchronized power operation with compatible upstream and downstream equipment\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Control IC:\u003c\/strong\u003e NJR NJU72315\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCapacitors:\u003c\/strong\u003e Premium ELNA audio capacitors\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRCA Connections:\u003c\/strong\u003e Gold-plated RCA jacks\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOperational Amplifiers:\u003c\/strong\u003e Replaceable left and right channel op-amps\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOp-Amp Customization:\u003c\/strong\u003e Supports replacement with electrically compatible operational amplifiers\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Control:\u003c\/strong\u003e Electronic volume adjustment using the front-panel control or remote\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Memory:\u003c\/strong\u003e Remembers the previous volume setting independently for each input source\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Selection:\u003c\/strong\u003e Front-panel power\/input selector or infrared remote\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Indicators:\u003c\/strong\u003e Dedicated LEDs indicating the selected audio source\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBass Control:\u003c\/strong\u003e ±12dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTreble Control:\u003c\/strong\u003e ±6dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLeft\/Right Balance Control:\u003c\/strong\u003e Adjustable stereo channel balance\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTone Bypass:\u003c\/strong\u003e Dedicated switch to bypass bass and treble adjustment circuitry\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-Pass Filter:\u003c\/strong\u003e Three-position selectable HPF for RCA\/XLR main outputs\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-Pass Filter Settings:\u003c\/strong\u003e Full range, 80Hz, and 120Hz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFull-Range Frequency Response:\u003c\/strong\u003e 20Hz–20kHz (±0.2dB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e80Hz HPF Frequency Response:\u003c\/strong\u003e 80Hz–20kHz (±0.2dB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e120Hz HPF Frequency Response:\u003c\/strong\u003e 120Hz–20kHz (±0.2dB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSubwoofer Output Frequency Response:\u003c\/strong\u003e 20Hz–200Hz (±0.2dB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced XLR Output Signal-to-Noise Ratio:\u003c\/strong\u003e At least 112dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced XLR Output Dynamic Range:\u003c\/strong\u003e At least 112dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced XLR Output THD+N:\u003c\/strong\u003e 0.0007% or less\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced XLR Output Noise Floor:\u003c\/strong\u003e 6µV or less\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUnbalanced RCA Output Signal-to-Noise Ratio:\u003c\/strong\u003e At least 115dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUnbalanced RCA Output Dynamic Range:\u003c\/strong\u003e At least 115dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUnbalanced RCA Output THD+N:\u003c\/strong\u003e 0.0008% or less\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUnbalanced RCA Output Noise Floor:\u003c\/strong\u003e 4µV or less\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer-Rated SINAD:\u003c\/strong\u003e At least 113dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer-Rated Channel Crosstalk:\u003c\/strong\u003e -130dB or lower\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Control:\u003c\/strong\u003e Included infrared remote\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Functions:\u003c\/strong\u003e Power on\/off, mute, volume increase\/decrease, and input selection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Compatibility:\u003c\/strong\u003e Supports selected Fosi Audio Z-Series components using dedicated product-selection controls\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Batteries:\u003c\/strong\u003e Batteries not included\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFront-Panel Controls:\u003c\/strong\u003e Power\/input selector, balance, bass, treble, and volume\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRear-Panel Connections:\u003c\/strong\u003e RCA inputs, XLR inputs, RCA outputs, XLR outputs, subwoofer output, and 12V trigger connections\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFilter and Bypass Switches:\u003c\/strong\u003e Located on the underside of the enclosure\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Input:\u003c\/strong\u003e AC mains\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Voltage Range:\u003c\/strong\u003e AC 110–240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Power Amplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker-Level Outputs:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In DAC:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Headphone Amplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadphone Output:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Phono Preamplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWi-Fi Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB Audio Input:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHDMI Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOptical\/Coaxial Digital Inputs:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApp Control:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEAN:\u003c\/strong\u003e 6976136960836\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio ZP3 Preamplifier, infrared remote control, AC power cord, 12V trigger cable, and user manual\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile Analog Source Management:\u003c\/strong\u003e Two stereo RCA inputs and one balanced XLR input allow the ZP3 to serve as a central control hub for multiple music sources, including DACs, streamers, CD players, and compatible phono preamplifiers.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePremium Balanced Audio Connectivity:\u003c\/strong\u003e Balanced XLR inputs and outputs, unbalanced RCA connections, and support for RCA\/XLR signal conversion make it easy to integrate components with different analog connections while maintaining low-noise performance.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eFlexible 2.1-Channel System Integration:\u003c\/strong\u003e A dedicated powered subwoofer output and selectable full-range, 80Hz, and 120Hz high-pass filter settings let you fine-tune bass management for bookshelf speakers, floorstanding speakers, and powered subwoofers.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eCustomizable Sound and Stereo Balance:\u003c\/strong\u003e Independent bass, treble, and left\/right balance adjustments provide convenient sound customization, while Tone Bypass offers a more direct signal path when additional EQ is not desired.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eConvenient Volume and System Control:\u003c\/strong\u003e Per-input volume memory, an included infrared remote, and dedicated 12V trigger input\/output connections simplify daily operation and integration with compatible audio components.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eHigh-Fidelity Preamplifier Performance:\u003c\/strong\u003e Premium ELNA capacitors, NJR electronic volume control, and carefully optimized analog circuitry provide excellent dynamic range, low distortion, and precise sound reproduction for dedicated Hi-Fi listening.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is the Fosi Audio ZP3 used for?\u003c\/strong\u003e\u003cbr\u003e A: The Fosi Audio ZP3 is a stereo preamplifier designed to manage multiple analog audio sources, control volume and tone, and send audio to compatible power amplifiers or powered speakers. It includes two stereo RCA inputs, one balanced XLR input, RCA and XLR preamplifier outputs, and a dedicated powered subwoofer output. It does not contain a built-in power amplifier, so passive speakers require a separate amplifier.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: How many audio inputs and outputs does the Fosi Audio ZP3 have?\u003c\/strong\u003e\u003cbr\u003e A: The ZP3 features three selectable stereo audio inputs: RCA 1, RCA 2, and balanced XLR. It also provides three analog output types: stereo RCA, balanced stereo XLR, and a dedicated RCA subwoofer output. Separate 12V trigger input and output connections support automatic power synchronization with compatible equipment.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio ZP3 have a 12V trigger?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The ZP3 includes both a 12V trigger input and a 12V trigger output. These connections allow compatible source components and power amplifiers to turn on and off together, making the ZP3 an excellent addition to systems built around compatible Fosi Audio products such as the ZD3 DAC and ZA3 power amplifier.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect a powered subwoofer to the Fosi Audio ZP3?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The ZP3 includes a dedicated RCA subwoofer output for connecting a powered subwoofer. Its three-position high-pass filter allows you to select full-range, 80Hz, or 120Hz operation for the main RCA\/XLR outputs, helping reduce unwanted low-frequency demands on your main speakers when a subwoofer handles deeper bass.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I adjust the bass, treble, and stereo balance on the Fosi Audio ZP3?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The ZP3 provides independent bass adjustment of ±12dB, treble adjustment of ±6dB, and a dedicated left\/right balance control. It also includes a Bypass switch that removes the bass and treble adjustment circuits from the signal path when you prefer a more direct listening experience.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I use both the RCA and XLR outputs on the Fosi Audio ZP3?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The ZP3's RCA and XLR outputs operate simultaneously, allowing compatible equipment to receive analog audio through both connection types. However, the outputs cannot be independently switched on or off, so connected components should be configured accordingly.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio ZP3 include a remote control?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The included infrared remote allows you to turn the preamplifier on or off, mute playback, adjust volume, and switch between the three available audio inputs. The ZP3 also features per-input volume memory, automatically recalling the previous volume setting when returning to a selected source.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio ZP3 have Bluetooth, a DAC, or a phono input?\u003c\/strong\u003e\u003cbr\u003e A: No. The ZP3 is a dedicated analog preamplifier and does not include Bluetooth, Wi-Fi, a built-in DAC, or a phono preamplifier. Digital sources must be connected through an external DAC or another component with analog outputs, while turntables require a built-in or external phono preamp before connecting to one of the ZP3's RCA inputs.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887288701087,"sku":"FOS-ZP3-BLK","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/e1fcbf9c-4a53-4938-83f6-ac27291febb3.jpg?v=1791570162"},{"product_id":"fosi-audio-v3-mono-240w-monoblock-power-amplifier-with-48v-5a-power-supply","title":"Fosi Audio V3 Mono 240W Monoblock Power Amplifier with 48V\/5A Power Supply","description":"\u003ch3\u003eFosi Audio V3 Mono 240W Monoblock Power Amplifier with 48V\/5A Power Supply\u003c\/h3\u003e  \u003cp\u003eExperience powerful, high-fidelity sound with the Fosi Audio V3 Mono Monoblock Power Amplifier, a compact Class-D amplifier designed to bring precision, clarity, and exceptional performance to your home audio system. Powered by the Texas Instruments TPA3255 amplifier chip and featuring advanced Post-Filter Feedback (PFFB) technology, the V3 Mono delivers up to 240 watts of rated power into 4 ohms with the included 48V\/5A power supply. Its dedicated single-channel design allows each amplifier to independently power one passive speaker, making it an excellent solution for building a dual-mono stereo system, expanding a multichannel home theater setup, or providing dedicated amplification for demanding speakers.\u003c\/p\u003e  \u003cp\u003eEngineered for clean, accurate audio reproduction, the V3 Mono incorporates PFFB technology to address load-dependent performance variations commonly associated with Class-D amplifiers. By feeding the amplified signal back through the output filter, this advanced circuit design helps minimize distortion, improve frequency response consistency, and maintain accurate sound reproduction across a wide range of speaker impedances. With a signal-to-noise ratio of at least 123dB, total harmonic distortion below 0.006%, and a SINAD rating of 101dB through its balanced input, the V3 Mono delivers impressive clarity, dynamic range, and detailed musical presentation.\u003c\/p\u003e  \u003cp\u003eDesigned for seamless integration into modern Hi-Fi systems, the Fosi Audio V3 Mono provides balanced XLR and 1\/4-inch TRS connectivity through a shared combo input, along with a dedicated unbalanced RCA input. A convenient input selector lets you choose between balanced and unbalanced sources, while adjustable RCA input gain settings of 25dB and 31dB provide additional flexibility when matching the amplifier with different preamplifiers and source components. Supporting passive speakers with impedances ranging from 2 to 8 ohms, the V3 Mono can be integrated with a wide selection of bookshelf and floorstanding speakers. Pair two units together to create a dedicated stereo system with independent monoblock amplification for each channel.\u003c\/p\u003e  \u003cp\u003eInside its durable aluminum chassis, the V3 Mono features carefully selected audio components, including Japanese Nichicon and ELNA capacitors, German WIMA capacitors, and Japanese Sumida inductors. An upgraded four-layer printed circuit board helps reduce electrical interference and optimize signal integrity, while two replaceable NE5532 operational amplifier positions allow enthusiasts to experiment with compatible DIP8 op-amps for personalized sound tuning. The amplifier's innovative full-body heat dissipation system places the TPA3255 chip in direct thermal contact with the chassis, allowing heat to dissipate through the enclosure. Dual side ventilation openings further improve airflow to support stable performance during extended listening sessions.\u003c\/p\u003e  \u003cp\u003eThe Fosi Audio V3 Mono also includes practical features for everyday operation. Its three-position On\/Auto\/Off switch provides manual power control or automatic signal-sensing operation, allowing the amplifier to enter standby after approximately 10 minutes without an audio signal and automatically resume playback when a signal returns. This eliminates the need to manually power the amplifier on and off during regular use. With its compact footprint, premium components, balanced connectivity, and included 48V\/5A power supply, the Fosi Audio V3 Mono is an excellent choice for listeners seeking powerful, efficient, and customizable monoblock amplification without the size and complexity of traditional high-power amplifiers.\u003c\/p\u003e  \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e V3 Mono\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e V3 MONO-48V5A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Monoblock power amplifier\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Class:\u003c\/strong\u003e Class-D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Channels:\u003c\/strong\u003e 1.0 (single-channel monoblock)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Chip:\u003c\/strong\u003e Texas Instruments TPA3255\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Technology:\u003c\/strong\u003e Post-Filter Feedback (PFFB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRated Output Power with Included 48V\/5A Supply:\u003c\/strong\u003e 240 watts × 1 into 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported Speaker Impedance:\u003c\/strong\u003e 2–8 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 10Hz–30kHz (±0.06dB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise Ratio:\u003c\/strong\u003e At least 123dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDynamic Range:\u003c\/strong\u003e At least 123dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion:\u003c\/strong\u003e Less than 0.006%\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSINAD with Balanced XLR Input:\u003c\/strong\u003e 101dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSINAD with RCA Input:\u003c\/strong\u003e 93dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Input Connections:\u003c\/strong\u003e RCA and combined XLR\/1\/4-inch TRS\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUnbalanced Analog Input:\u003c\/strong\u003e 1 × RCA\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced Analog Input:\u003c\/strong\u003e 1 × XLR\/1\/4-inch TRS combo jack\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced Input Compatibility:\u003c\/strong\u003e XLR or 1\/4-inch TRS cables\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Selection:\u003c\/strong\u003e Dedicated RCA\/balanced input selector switch\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBalanced Input Gain:\u003c\/strong\u003e 20dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRCA Input Gain Settings:\u003c\/strong\u003e Selectable 25dB or 31dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eGain Selection:\u003c\/strong\u003e Rear-panel gain switch for RCA input\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eGain Switch Function:\u003c\/strong\u003e Adjusts RCA input gain; does not affect balanced input mode\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Outputs:\u003c\/strong\u003e 1 pair of speaker binding-post terminals\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Connections:\u003c\/strong\u003e Supports banana plugs and bare speaker wire\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker A\/B Selector:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSimultaneous Speaker Channels:\u003c\/strong\u003e 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDual-Mono System Compatibility:\u003c\/strong\u003e Two V3 Mono amplifiers can independently power the left and right speakers in a stereo system\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMultichannel System Integration:\u003c\/strong\u003e Additional units can provide dedicated amplification for compatible individual home theater channels\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOperational Amplifiers:\u003c\/strong\u003e NE5532\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReplaceable Op-Amps:\u003c\/strong\u003e 2 replaceable dual-channel DIP8 op-amp positions\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatible Op-Amp Examples:\u003c\/strong\u003e Sparkos SS3602, MUSES02, OPA2604, Burson V5i, and other electrically compatible DIP8 dual operational amplifiers\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCapacitors:\u003c\/strong\u003e Japanese Nichicon and ELNA capacitors; German WIMA capacitors\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInductors:\u003c\/strong\u003e Japanese Sumida inductors\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCircuit Board:\u003c\/strong\u003e Upgraded four-layer PCB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling System:\u003c\/strong\u003e Full-body chassis heat dissipation with dual side ventilation openings\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal Design:\u003c\/strong\u003e Amplifier chip thermally coupled to the enclosure for efficient heat transfer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Control:\u003c\/strong\u003e Three-position On\/Auto\/Off switch\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAutomatic Signal Sensing:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAutomatic Standby:\u003c\/strong\u003e After approximately 10 minutes without an audio signal\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAutomatic Wake:\u003c\/strong\u003e Reactivates when an audio signal is detected\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Input:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Output:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Control:\u003c\/strong\u003e No dedicated volume adjustment; designed for use with a compatible preamplifier or variable-output source\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBass and Treble Controls:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Input:\u003c\/strong\u003e DC 32–48V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Power Supply:\u003c\/strong\u003e 48V\/5A DC external power adapter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Power Supply Rating:\u003c\/strong\u003e 240W\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eChassis Construction:\u003c\/strong\u003e Compact metal enclosure with integrated heat dissipation\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 105 × 35 × 142mm (approximately 4.13 × 1.38 × 5.59 inches)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approximately 480g (1.06 lbs)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWi-Fi Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Music Streaming:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApple AirPlay:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In DAC:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDigital Audio Inputs:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHDMI Inputs:\u003c\/strong\u003e 0\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHDMI Outputs:\u003c\/strong\u003e 0\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSubwoofer Output:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadphone Output:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApp Control:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Control:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEAN:\u003c\/strong\u003e 6976136960447\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio V3 Mono Power Amplifier, 48V\/5A power supply, and user manual\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePowerful Dedicated Monoblock Amplification:\u003c\/strong\u003e The Texas Instruments TPA3255 Class-D amplifier delivers 240 watts of rated power into 4 ohms with the included 48V\/5A power supply, providing dedicated amplification for a single passive speaker.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eBuilding Dual-Mono Stereo Systems:\u003c\/strong\u003e Pair two V3 Mono amplifiers to independently power the left and right speakers, creating a flexible stereo setup with dedicated amplification for each channel.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eAccurate Sound with PFFB Technology:\u003c\/strong\u003e Post-Filter Feedback circuitry minimizes load-dependent frequency response variations and distortion, helping deliver clean, detailed audio across compatible speaker loads.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eBalanced and Unbalanced Connectivity:\u003c\/strong\u003e A combined XLR\/1\/4-inch TRS balanced input and dedicated RCA connection provide convenient compatibility with a wide range of preamplifiers, DACs, and line-level audio sources.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePremium Audiophile Components:\u003c\/strong\u003e Nichicon, ELNA, and WIMA capacitors, Sumida inductors, and an upgraded four-layer PCB support low-noise, high-fidelity performance, while replaceable op-amps allow additional customization.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eEfficient Cooling and Automatic Operation:\u003c\/strong\u003e Full-body chassis heat dissipation, side ventilation, and automatic signal-sensing standby provide reliable performance with convenient everyday operation.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: How much power does the Fosi Audio V3 Mono deliver?\u003c\/strong\u003e\u003cbr\u003e A: The Fosi Audio V3 Mono delivers a manufacturer-rated 240 watts into 4 ohms with the included 48V\/5A power supply. It uses a Texas Instruments TPA3255 Class-D amplifier chip with PFFB technology to provide efficient, low-distortion amplification for a single passive speaker. Actual output depends on speaker impedance and operating conditions.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Is the Fosi Audio V3 Mono a stereo amplifier?\u003c\/strong\u003e\u003cbr\u003e A: No. The V3 Mono is a single-channel monoblock amplifier designed to power one passive speaker. To create a traditional two-channel stereo system, you will need two V3 Mono amplifiers, with one powering the left speaker and the other powering the right speaker.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does this version of the Fosi Audio V3 Mono include the 48V power supply?\u003c\/strong\u003e\u003cbr\u003e A: Yes. This version includes one 48V\/5A external power supply and is rated to deliver 240 watts into 4 ohms. The V3 Mono is also available in other power supply configurations, but this particular model includes the 48V\/5A adapter.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What audio inputs does the Fosi Audio V3 Mono have?\u003c\/strong\u003e\u003cbr\u003e A: The V3 Mono includes one RCA unbalanced input and one balanced XLR\/1\/4-inch TRS combo input. A dedicated switch allows selection between RCA and balanced input modes. The RCA input also includes selectable 25dB and 31dB gain settings for matching different source components.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio V3 Mono have a 12V trigger?\u003c\/strong\u003e\u003cbr\u003e A: No. The V3 Mono does not include a dedicated 12V trigger input or output. Instead, it features automatic signal-sensing operation. When set to Auto mode, the amplifier enters standby after approximately 10 minutes without an audio signal and automatically reactivates when a signal returns.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What speakers are compatible with the Fosi Audio V3 Mono?\u003c\/strong\u003e\u003cbr\u003e A: The V3 Mono supports passive speakers with impedances ranging from 2 to 8 ohms. It can be used with many bookshelf and floorstanding speakers, provided their power handling and electrical requirements are compatible. Each V3 Mono amplifier powers only one speaker, so a stereo pair requires two amplifiers.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I replace the op-amps in the Fosi Audio V3 Mono?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The V3 Mono includes two replaceable DIP8 operational amplifier positions, allowing enthusiasts to experiment with compatible aftermarket op-amps. Options include models such as the Sparkos SS3602, MUSES02, OPA2604, and compatible Burson designs. Always confirm electrical compatibility and correct installation orientation before replacing components.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio V3 Mono have Bluetooth, streaming, or a built-in DAC?\u003c\/strong\u003e\u003cbr\u003e A: No. The V3 Mono is a dedicated analog power amplifier and does not include Bluetooth, Wi-Fi, music streaming, a built-in DAC, or digital audio inputs. To play music from digital sources, connect a compatible external DAC, music streamer, or preamplifier with RCA or balanced analog output. A preamplifier or variable-output source is recommended for volume control.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887291486367,"sku":"FOS-V3MONO-BLK","price":139.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/89099a90-6661-40c1-b0ac-30e7726a7fbc.jpg?v=1791571045"},{"product_id":"fosi-audio-mc331-tube-integrated-amplifier-with-dac-bluetooth","title":"Fosi Audio MC331 Tube Integrated Amplifier with DAC \u0026 Bluetooth","description":"\u003ch3\u003eFosi Audio MC331 Tube Integrated Amplifier with DAC \u0026amp; Bluetooth\u003c\/h3\u003e  \u003cp\u003eBring vintage-inspired style and modern Hi-Fi performance to your listening space with the Fosi Audio MC331 Tube Integrated Amplifier with DAC \u0026amp; Bluetooth, a versatile all-in-one audio solution designed for music enthusiasts who appreciate the character of vacuum tubes and the convenience of modern connectivity. Combining a hybrid tube preamplifier design, Texas Instruments TPA3221 Class-D amplification, and a built-in digital-to-analog converter, the MC331 delivers up to 105 watts per channel into 4 ohms at its maximum rated output. With Bluetooth wireless streaming, USB, optical, coaxial, and RCA inputs, along with a built-in headphone amplifier and classic analog VU meter, the MC331 brings multiple audio components together in one compact and stylish desktop amplifier.\u003c\/p\u003e  \u003cp\u003eDesigned to combine the character of traditional tube audio with the efficiency of modern amplification, the MC331 features two replaceable 5654W vacuum tubes that contribute to its distinctive sound and appearance. These tubes work alongside the Texas Instruments TPA3221 amplifier chip to deliver an engaging listening experience with clear vocals, detailed instruments, and dynamic musical reproduction. The front-panel analog VU meter adds a classic Hi-Fi aesthetic, displaying audio signal activity with a moving needle that responds to your music. With its exposed vacuum tubes, retro-inspired styling, and compact enclosure, the MC331 makes an attractive centerpiece for desktop listening stations, bookshelf speaker systems, and smaller dedicated Hi-Fi setups.\u003c\/p\u003e  \u003cp\u003eConnectivity is one of the MC331's greatest strengths. Bluetooth wireless streaming with SBC and AAC codec support makes it easy to enjoy music from compatible smartphones, tablets, and computers, while USB, optical, and coaxial digital inputs allow direct connections to digital audio sources. A dedicated stereo RCA input accommodates traditional analog components such as CD players, external DACs, and turntables equipped with a built-in or external phono preamplifier. The integrated DAC supports digital audio playback up to 24-bit\/96kHz through compatible USB, optical, and coaxial connections, providing a convenient way to enjoy high-quality audio without requiring a separate DAC.\u003c\/p\u003e  \u003cp\u003eBeyond driving passive speakers, the Fosi Audio MC331 includes a dedicated 3.5mm headphone output for personal listening with compatible headphones rated from 32 to 300 ohms. A rear-panel preamplifier output also allows connection to additional compatible audio equipment, including powered subwoofers, making it possible to expand into a 2.1-channel system. Independent bass and treble controls provide convenient sound adjustments, allowing you to tailor playback to your speakers, room, or musical preferences. The included infrared remote adds another level of convenience with control over power, volume, input selection, Bluetooth playback, bass, and treble from your listening position.\u003c\/p\u003e  \u003cp\u003ePowered by an included 24V\/4.5A adapter, the MC331 delivers flexible stereo amplification in a compact enclosure that fits comfortably into a desktop or entertainment center setup. Its multifunction volume knob provides quick access to input switching and power control, while front-panel indicators make it easy to identify the selected source. The replaceable vacuum tubes allow enthusiasts to experiment with compatible alternatives such as 6AK5, 6AK5W, 6J1, and 6Zh1P to personalize their listening experience. Whether you're streaming music wirelessly, playing CDs, connecting a computer, or enjoying a private headphone listening session, the Fosi Audio MC331 combines modern functionality with the visual appeal of classic tube Hi-Fi equipment.\u003c\/p\u003e  \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e MC331\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Hybrid tube integrated stereo amplifier with DAC, Bluetooth, and headphone amplifier\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Configuration:\u003c\/strong\u003e Hybrid vacuum tube and Class-D amplification\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Channels:\u003c\/strong\u003e 2.0-channel stereo\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported System Configuration:\u003c\/strong\u003e Stereo or 2.1-channel with compatible powered subwoofer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Chip:\u003c\/strong\u003e Texas Instruments TPA3221\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVacuum Tubes:\u003c\/strong\u003e 2 × 5654W\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTube Configuration:\u003c\/strong\u003e Replaceable vacuum tubes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatible Replacement Tubes:\u003c\/strong\u003e 6AK5, 6AK5W, 6Zh1P, 6J1, 6J1P, EF95, and other compatible tube models\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTube Warm-Up Time:\u003c\/strong\u003e Approximately 15 seconds after powering on\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In DAC:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Headphone Amplifier:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Rated Speaker Output Power:\u003c\/strong\u003e 105 watts × 2 into 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported Speaker Impedance:\u003c\/strong\u003e 4–8 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 20Hz–20kHz (±1dB)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise Ratio:\u003c\/strong\u003e At least 100dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDynamic Range:\u003c\/strong\u003e At least 100dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion:\u003c\/strong\u003e 0.03% or less\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Audio Input Types:\u003c\/strong\u003e 5\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAnalog Audio Input:\u003c\/strong\u003e 1 × stereo RCA pair\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB Audio Input:\u003c\/strong\u003e 1 × USB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOptical Digital Input:\u003c\/strong\u003e 1 × TOSLINK\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCoaxial Digital Input:\u003c\/strong\u003e 1 × coaxial S\/PDIF\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWireless Audio Input:\u003c\/strong\u003e Bluetooth\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Modes:\u003c\/strong\u003e RCA, Bluetooth, USB, optical, and coaxial\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum USB Audio Resolution:\u003c\/strong\u003e PCM up to 24-bit\/96kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Optical Audio Resolution:\u003c\/strong\u003e PCM up to 24-bit\/96kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Coaxial Audio Resolution:\u003c\/strong\u003e PCM up to 24-bit\/96kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Audio Codecs:\u003c\/strong\u003e SBC and AAC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Wireless Range:\u003c\/strong\u003e At least 10 meters (approximately 33 feet) under suitable conditions\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Antenna:\u003c\/strong\u003e External antenna, included\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Audio Output Types:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Outputs:\u003c\/strong\u003e 1 stereo pair of binding-post speaker terminals\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadphone Output:\u003c\/strong\u003e 1 × 3.5mm stereo headphone jack\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePreamplifier Output:\u003c\/strong\u003e 1 × 3.5mm stereo pre-out\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadphone Impedance Compatibility:\u003c\/strong\u003e 32–300 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadphone Priority:\u003c\/strong\u003e Inserting headphones mutes the passive speaker outputs\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePowered Subwoofer Compatibility:\u003c\/strong\u003e Supported through the preamplifier output with an appropriate connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker A\/B Selector:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Pairs Supported:\u003c\/strong\u003e 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Control:\u003c\/strong\u003e Front-panel multifunction rotary knob\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBass Control:\u003c\/strong\u003e Independent front-panel bass adjustment\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTreble Control:\u003c\/strong\u003e Independent front-panel treble adjustment\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVU Meter:\u003c\/strong\u003e 1 front-panel analog needle-style meter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Indicators:\u003c\/strong\u003e Front-panel LED source indicators\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Control:\u003c\/strong\u003e Included infrared remote\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Functions:\u003c\/strong\u003e Power on\/off, mute, volume adjustment, previous track, play\/pause, next track, input selection, Bluetooth mode, Bluetooth pairing reset, bass adjustment, and treble adjustment\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Control:\u003c\/strong\u003e Multifunction power, input selection, and volume knob\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Input:\u003c\/strong\u003e DC 19–24V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Power Supply:\u003c\/strong\u003e 24V\/4.5A DC adapter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Design:\u003c\/strong\u003e Compact desktop enclosure with exposed vacuum tubes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e Approximately 10 × 2 × 2.7 inches (manufacturer-listed dimensions)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApple AirPlay:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWi-Fi Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Music Streaming Services:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHDMI Inputs:\u003c\/strong\u003e 0\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHDMI Outputs:\u003c\/strong\u003e 0\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Input:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Output:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Phono Preamplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApp Control:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio MC331 amplifier, 2 × 5654W vacuum tubes, 2 × tube covers, Bluetooth antenna, infrared remote control, 24V\/4.5A power adapter, and user manual\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eClassic Tube Sound with Modern Amplification:\u003c\/strong\u003e Two replaceable 5654W vacuum tubes combine with efficient Texas Instruments TPA3221 Class-D amplification to deliver an engaging listening experience with the distinctive character of tube-based Hi-Fi equipment.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eVersatile All-in-One Audio Connectivity:\u003c\/strong\u003e Bluetooth, USB, optical, coaxial, and stereo RCA inputs accommodate a wide range of digital and analog sources, reducing the need for multiple separate components.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePowerful Stereo Speaker Amplification:\u003c\/strong\u003e With a maximum manufacturer-rated output of 105 watts per channel into 4 ohms, the MC331 provides capable amplification for compatible passive bookshelf and compact floorstanding speakers.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eDedicated Headphone and Preamplifier Outputs:\u003c\/strong\u003e A 3.5mm headphone output supports compatible headphones from 32 to 300 ohms, while a separate pre-out provides flexibility for connecting additional audio equipment or a powered subwoofer.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eClassic Analog VU Meter Design:\u003c\/strong\u003e The front-panel VU meter and exposed vacuum tubes create a vintage-inspired visual presentation that adds personality to modern desktop and home Hi-Fi systems.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eConvenient Sound Customization and Control:\u003c\/strong\u003e Independent bass and treble adjustments, replaceable vacuum tubes, a multifunction volume knob, and an included infrared remote make it easy to tailor and manage your listening experience.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is the Fosi Audio MC331 Tube Integrated Amplifier?\u003c\/strong\u003e\u003cbr\u003e A: The Fosi Audio MC331 is a 2-channel hybrid tube integrated amplifier that combines a vacuum tube preamplifier stage, Class-D speaker amplification, built-in DAC, Bluetooth connectivity, and headphone amplification. It allows you to connect multiple digital and analog audio sources while powering compatible passive speakers or wired headphones.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: How much power does the Fosi Audio MC331 deliver?\u003c\/strong\u003e\u003cbr\u003e A: The MC331 has a maximum manufacturer-rated output of 105 watts per channel into 4 ohms using the included 24V\/4.5A power adapter. It supports passive speakers rated between 4 and 8 ohms. This is a maximum output specification rather than a continuous RMS power rating.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio MC331 support Bluetooth and wireless music streaming?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The MC331 includes Bluetooth wireless audio connectivity with SBC and AAC codec support, allowing you to stream music from compatible smartphones, tablets, and computers. It does not include built-in Wi-Fi, Apple AirPlay, Spotify Connect, or other independent network streaming services.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What audio inputs does the Fosi Audio MC331 have?\u003c\/strong\u003e\u003cbr\u003e A: The MC331 features five selectable input types: stereo RCA, USB, optical digital, coaxial digital, and Bluetooth. Its built-in DAC supports digital audio playback up to 24-bit\/96kHz through compatible USB, optical, and coaxial connections.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect headphones to the Fosi Audio MC331?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The MC331 includes a dedicated 3.5mm headphone output designed for compatible wired headphones with impedances from 32 to 300 ohms. When headphones are connected, the amplifier automatically prioritizes headphone playback and mutes the passive speaker outputs.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect a subwoofer to the Fosi Audio MC331?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The MC331 includes a rear-panel preamplifier output that can connect to a compatible powered subwoofer using an appropriate cable. This allows you to expand a traditional stereo speaker setup into a 2.1-channel system. The MC331 does not include a dedicated speaker-level subwoofer amplifier or adjustable subwoofer crossover.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I replace the vacuum tubes in the Fosi Audio MC331?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The MC331 features two replaceable 5654W vacuum tubes. Compatible alternatives include 6AK5, 6AK5W, 6Zh1P, 6J1, and other electrically compatible models. Changing tubes allows enthusiasts to experiment with different tube characteristics. Always power off the amplifier, disconnect it from power, and allow the tubes to cool completely before replacing them.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio MC331 have a remote control and adjustable bass and treble?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The MC331 includes independent bass and treble controls on the front panel, along with an infrared remote that supports power, volume, mute, input selection, Bluetooth playback, and tone adjustments. A multifunction volume knob also allows convenient operation directly from the amplifier.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887292960927,"sku":"FOS-MC331-BLK","price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/c2c1b121-3906-4846-9993-5dfea1956876.jpg?v=1791571444"},{"product_id":"fosi-audio-mc351-2-1-channel-integrated-amplifier-with-dac-vu-meter","title":"Fosi Audio MC351 2.1-Channel Integrated Amplifier with DAC \u0026 VU Meter","description":"\u003ch3\u003eFosi Audio MC351 2.1-Channel Integrated Amplifier with DAC \u0026amp; VU Meter\u003c\/h3\u003e  \u003cp\u003eBring powerful sound and vintage-inspired style to your home audio system with the Fosi Audio MC351 2.1-Channel Integrated Amplifier with DAC \u0026amp; VU Meter. Combining two Texas Instruments TPA3255 Class-D amplifier chips, a built-in digital-to-analog converter, and flexible wired and wireless connectivity, the MC351 offers an all-in-one solution for music enthusiasts looking to build a compact stereo or 2.1-channel audio system. With a manufacturer-advertised maximum output of up to 165 watts per channel for passive stereo speakers and 350 watts for a passive subwoofer at 4 ohms, the MC351 delivers flexible amplification for a variety of listening setups. Bluetooth 5.3, USB, optical, coaxial, and RCA inputs make it easy to connect your favorite music sources, while a classic analog VU meter adds a distinctive retro touch.\u003c\/p\u003e  \u003cp\u003eAt the heart of the MC351 are two Texas Instruments TPA3255 amplifier chips that provide efficient Class-D amplification for left and right speakers and a dedicated passive subwoofer channel. Unlike traditional stereo amplifiers that require a separate powered subwoofer, the MC351 features speaker-level subwoofer terminals that can directly drive a compatible passive subwoofer. This makes it an appealing choice for building an integrated 2.1-channel system without adding a separate subwoofer amplifier. Its dual-PCB layout helps separate input and output circuitry to reduce unwanted interference, while dual 4700µF capacitors and an extensive 100-fin heatsink support stable operation and consistent audio performance. The MC351 supports compatible 4–8-ohm speakers and operates with a DC power supply ranging from 24V to 48V.\u003c\/p\u003e  \u003cp\u003eDesigned for everyday convenience, the Fosi Audio MC351 offers five selectable audio inputs to accommodate both modern digital and traditional analog music sources. Bluetooth 5.3 with SBC and AAC codec support allows wireless audio playback from compatible smartphones, tablets, and computers. The USB digital audio input supports PCM playback up to 24-bit\/96kHz, while optical and coaxial inputs support resolutions up to 32-bit\/192kHz. A stereo RCA input provides connectivity for compatible CD players, external DACs, music streamers, and turntables equipped with a built-in or external phono preamplifier. A dedicated 3.5mm preamplifier output also provides flexibility for connecting powered speakers, a powered subwoofer, or an additional amplifier.\u003c\/p\u003e  \u003cp\u003eOne of the MC351's most distinctive features is its circular analog VU meter, which brings the nostalgic appearance of classic Hi-Fi equipment to a modern integrated amplifier. The responsive needle follows changes in the audio signal, providing a visual representation of your music as it plays. Five front-panel input indicators make it easy to identify the selected audio source, while a dedicated MODE button allows quick switching between Bluetooth, RCA, USB, optical, and coaxial inputs. Independent bass and treble controls feature center detents for straightforward tone adjustment, making it easy to customize the sound to suit your speakers, listening room, and musical preferences.\u003c\/p\u003e  \u003cp\u003eBuilt for convenient everyday listening, the MC351 features an automatic standby function that activates after approximately two minutes without an input signal, helping reduce power consumption when the amplifier is not in use. Its compact CNC-machined aluminum alloy enclosure features a finely sandblasted finish, seamless construction, and a durable all-metal design that fits naturally into desktop audio setups, compact entertainment centers, and dedicated listening spaces. Available with 32V\/5A or 48V\/5A power supply configurations, the MC351 offers flexibility for different system requirements. Whether you're streaming music wirelessly, enjoying your CD collection, or building a compact stereo system with a passive subwoofer, the Fosi Audio MC351 combines versatile connectivity, efficient amplification, and classic Hi-Fi styling in one convenient component.\u003c\/p\u003e  \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e MC351\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e 2.1-channel integrated amplifier with DAC, Bluetooth, and VU meter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Class:\u003c\/strong\u003e Class-D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Channels:\u003c\/strong\u003e 2.1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Configuration:\u003c\/strong\u003e Left and right passive stereo speakers plus one passive subwoofer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmplifier Chips:\u003c\/strong\u003e Texas Instruments TPA3255 ×2\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In DAC:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer-Advertised Maximum Output Power:\u003c\/strong\u003e 165W × 2 + 350W at 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Stereo Speaker Output Rating:\u003c\/strong\u003e 165 watts per channel at 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Passive Subwoofer Output Rating:\u003c\/strong\u003e 350 watts at 4 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Rating Note:\u003c\/strong\u003e Manufacturer maximum ratings; actual sustained and simultaneous output depends on speaker impedance, power supply, and operating conditions\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported Speaker Impedance:\u003c\/strong\u003e 4–8 ohms\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 20Hz–20kHz (±0.5dB, user manual specification)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSubwoofer Output Frequency Range:\u003c\/strong\u003e 20Hz–250Hz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise Ratio:\u003c\/strong\u003e At least 100dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDynamic Range:\u003c\/strong\u003e At least 100dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion:\u003c\/strong\u003e 0.03% or less\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInternal Circuit Design:\u003c\/strong\u003e Separate input and output circuit board sections\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFilter Capacitors:\u003c\/strong\u003e 2 × 4700µF\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling System:\u003c\/strong\u003e Integrated 100-fin heatsink\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Selectable Audio Inputs:\u003c\/strong\u003e 5\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Input:\u003c\/strong\u003e Bluetooth 5.3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAnalog RCA Input:\u003c\/strong\u003e 1 stereo RCA pair\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOptical Digital Input:\u003c\/strong\u003e 1 × TOSLINK\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCoaxial Digital Input:\u003c\/strong\u003e 1 × coaxial S\/PDIF\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB Audio Input:\u003c\/strong\u003e 1 × USB digital audio connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Modes:\u003c\/strong\u003e Bluetooth, RCA, optical, coaxial, and USB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum USB Audio Resolution:\u003c\/strong\u003e PCM up to 24-bit\/96kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Optical Audio Resolution:\u003c\/strong\u003e PCM up to 32-bit\/192kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Coaxial Audio Resolution:\u003c\/strong\u003e PCM up to 32-bit\/192kHz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB Function:\u003c\/strong\u003e Digital audio data input; does not provide power to the amplifier\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Version:\u003c\/strong\u003e 5.3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Audio Codecs:\u003c\/strong\u003e SBC and AAC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Wireless Range:\u003c\/strong\u003e At least 10 meters (approximately 33 feet) in an unobstructed environment\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Antenna:\u003c\/strong\u003e External antenna connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Audio Output Types:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eStereo Speaker Outputs:\u003c\/strong\u003e 1 stereo pair of binding-post terminals\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePassive Subwoofer Output:\u003c\/strong\u003e 1 amplified speaker-level output\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePreamplifier Output:\u003c\/strong\u003e 1 × 3.5mm analog pre-out\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePre-Out Volume Control:\u003c\/strong\u003e Adjustable using the main volume control\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePre-Out Tone Control:\u003c\/strong\u003e Bass and treble controls do not affect pre-out signal\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePre-Out Compatibility:\u003c\/strong\u003e Compatible powered speakers, powered subwoofers, or external amplifiers\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePassive Subwoofer Compatibility:\u003c\/strong\u003e Supports compatible passive subwoofers through dedicated amplified terminals\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker Pairs Supported:\u003c\/strong\u003e 1 stereo pair\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSpeaker A\/B Selector:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSubwoofer Channel:\u003c\/strong\u003e Dedicated amplified mono channel\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVU Meter:\u003c\/strong\u003e 1 analog circular needle-style meter\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVU Meter Function:\u003c\/strong\u003e Displays changes in audio signal level during playback\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Indicators:\u003c\/strong\u003e 5 front-panel LED indicators\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Selection:\u003c\/strong\u003e Dedicated front-panel MODE button\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVolume Control:\u003c\/strong\u003e Front-panel rotary knob\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Control:\u003c\/strong\u003e Combined power switch and volume knob\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBass Control:\u003c\/strong\u003e Independent adjustable rotary knob\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTreble Control:\u003c\/strong\u003e Independent adjustable rotary knob\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTone Control Center Detents:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAutomatic Standby:\u003c\/strong\u003e Activates after approximately 2 minutes without an input signal\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInput Memory:\u003c\/strong\u003e Restores the previously selected input mode after restarting\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported DC Input Voltage:\u003c\/strong\u003e 24–48V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eStandard Power Supply Configuration:\u003c\/strong\u003e 32V\/5A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOptional Power Supply Configuration:\u003c\/strong\u003e 48V\/5A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Power Supply:\u003c\/strong\u003e 32V\/5A DC power adapter for the default version\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eChassis Material:\u003c\/strong\u003e Aluminum alloy\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eChassis Construction:\u003c\/strong\u003e CNC-machined integrated enclosure\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Finely sandblasted metal finish\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 7.28 × 5.0 × 2.24 inches (W × D × H)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApple AirPlay:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWi-Fi Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Network Music Streaming Services:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHDMI Inputs:\u003c\/strong\u003e 0\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHDMI Outputs:\u003c\/strong\u003e 0\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Input:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger Output:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHeadphone Output:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Phono Preamplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRemote Control:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApp Control:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio MC351 integrated amplifier, 32V\/5A power adapter, Bluetooth antenna, and user manual (standard configuration)\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePowerful 2.1-Channel Amplification:\u003c\/strong\u003e Two Texas Instruments TPA3255 Class-D amplifier chips provide dedicated amplification for passive stereo speakers and a compatible passive subwoofer, with manufacturer-advertised maximum output ratings of 165W × 2 + 350W at 4 ohms.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eVersatile Wired and Wireless Connectivity:\u003c\/strong\u003e Bluetooth 5.3, USB, optical, coaxial, and stereo RCA inputs allow easy integration with compatible smartphones, computers, CD players, DACs, and other audio sources.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eBuilt-In High-Resolution DAC:\u003c\/strong\u003e Digital audio playback supports PCM up to 24-bit\/96kHz through USB and up to 32-bit\/192kHz through optical and coaxial inputs, making it convenient to enjoy digital music without a separate converter.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eDedicated Passive Subwoofer Amplification:\u003c\/strong\u003e An independent speaker-level subwoofer output allows direct connection to a compatible passive subwoofer, eliminating the need for a separate powered subwoofer amplifier in many 2.1-channel systems.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eClassic Analog VU Meter and Customizable Sound:\u003c\/strong\u003e A responsive circular VU meter, five input indicators, and independent bass and treble controls combine vintage-inspired styling with convenient sound adjustments.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePremium Construction and Efficient Operation:\u003c\/strong\u003e A CNC-machined aluminum enclosure, dual 4700µF capacitors, 100-fin heatsink, and automatic standby after approximately two minutes of inactivity support reliable everyday performance.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is the Fosi Audio MC351 Integrated Amplifier?\u003c\/strong\u003e\u003cbr\u003e A: The Fosi Audio MC351 is a 2.1-channel integrated amplifier with a built-in DAC, Bluetooth 5.3, and analog VU meter. It is designed to power two passive stereo speakers and one compatible passive subwoofer while providing USB, optical, coaxial, RCA, and Bluetooth audio inputs for a variety of digital and analog music sources.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: How much power does the Fosi Audio MC351 deliver?\u003c\/strong\u003e\u003cbr\u003e A: Fosi Audio advertises maximum output ratings of 165 watts per channel for the stereo speakers and 350 watts for the passive subwoofer channel at 4 ohms. The amplifier supports 24–48V DC power supplies, with 32V\/5A and 48V\/5A configurations available. Actual output depends on the power supply, speaker impedance, and operating conditions, and the maximum ratings should not be interpreted as continuous simultaneous RMS output with the standard 32V\/5A supply.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect a passive subwoofer to the Fosi Audio MC351?\u003c\/strong\u003e\u003cbr\u003e A: Yes. Unlike many integrated amplifiers that only provide a line-level output for a powered subwoofer, the MC351 includes a dedicated amplified subwoofer channel with speaker-level binding posts. This allows it to directly drive a compatible passive subwoofer without requiring a separate subwoofer amplifier.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What audio inputs does the Fosi Audio MC351 have?\u003c\/strong\u003e\u003cbr\u003e A: The MC351 includes five selectable input types: Bluetooth 5.3, USB digital audio, optical digital, coaxial digital, and stereo RCA analog. The front-panel MODE button allows you to switch between sources, while five LED indicators identify the currently selected input.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio MC351 support Bluetooth music streaming?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The MC351 features Bluetooth 5.3 with SBC and AAC codec support for wireless music playback from compatible smartphones, tablets, and computers. However, it does not include Wi-Fi, Apple AirPlay, Spotify Connect, TIDAL Connect, or other built-in network music streaming services.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect a powered subwoofer or an additional amplifier to the Fosi Audio MC351?\u003c\/strong\u003e\u003cbr\u003e A: Yes. In addition to its dedicated amplified passive subwoofer output, the MC351 includes a 3.5mm analog preamplifier output for compatible powered speakers, powered subwoofers, or external amplifiers. The pre-out level follows the main volume control but is not affected by the MC351's bass and treble adjustments.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio MC351 include a DAC and support high-resolution audio?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The MC351 features an integrated digital-to-analog converter supporting PCM playback up to 24-bit\/96kHz through its USB input and up to 32-bit\/192kHz through its optical and coaxial inputs. This allows compatible computers, digital music sources, and CD transports to connect directly without requiring a separate external DAC.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio MC351 have a remote control, 12V trigger, or HDMI connection?\u003c\/strong\u003e\u003cbr\u003e A: No. The MC351 does not include an infrared remote, dedicated 12V trigger input or output, or HDMI connectivity. Input switching, volume adjustment, and bass and treble settings are controlled directly through the front-panel controls. The amplifier also includes an automatic standby feature that activates after approximately two minutes without an input signal.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887305969823,"sku":"FOS-MC351-32-BLK","price":189.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/f44a4db9-552f-48cf-981e-ff4a6f1d6d32.jpg?v=1791573545"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/collections\/720a6638-0346-4917-a2c7-2c1aad82f77b.jpg?v=1791900948","url":"https:\/\/listenup.com\/collections\/fosi-audio-integrated-stereo-power-amps.oembed","provider":"ListenUp","version":"1.0","type":"link"}