{"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","url":"https:\/\/listenup.com\/products\/fosi-audio-za3-balanced-2-1-channel-power-amplifier","provider":"ListenUp","version":"1.0","type":"link"}