{"product_id":"fosi-audio-box-x5-mm-mc-phono-preamplifier-with-4-level-gain-adjustment","title":"Fosi Audio BOX X5 MM\/MC Phono Preamplifier with 4-Level Gain Adjustment","description":"\u003ch3\u003eFosi Audio BOX X5 MM\/MC Phono Preamplifier with 4-Level Gain Adjustment\u003c\/h3\u003e  \u003cp\u003eBring greater clarity, detail, and musical depth to your vinyl collection with the Fosi Audio BOX X5 MM\/MC Phono Preamplifier. Designed for turntable enthusiasts looking to upgrade their analog audio system, the BOX X5 combines precision RIAA equalization, four selectable gain settings, and compatibility with both moving magnet (MM) and moving coil (MC) cartridges in a compact, all-aluminum enclosure. Featuring premium audio components, low-noise circuitry, and gold-plated RCA connections, the BOX X5 provides the essential signal amplification and equalization needed to enjoy vinyl records through compatible stereo amplifiers and powered speakers.\u003c\/p\u003e  \u003cp\u003eAt the heart of the BOX X5 is a carefully engineered phono amplification circuit designed to preserve the subtle details captured in your favorite records. Its Texas Instruments OPA1612 operational amplifier works alongside 2% precision polyester film capacitors, 0.1% high-precision film resistors, and specialized copper-lead audio capacitors to minimize unwanted noise and signal distortion. Precise RIAA equalization restores the tonal balance of vinyl recordings, helping deliver accurate bass, natural midrange reproduction, and clear high-frequency detail. With a manufacturer-rated signal-to-noise ratio of at least 92dB and total harmonic distortion of 0.009% or less under specified test conditions, the BOX X5 provides a clean and reliable foundation for dedicated analog listening.\u003c\/p\u003e  \u003cp\u003eOne of the BOX X5's most versatile features is its adjustable gain system, which provides four selectable amplification levels of 38dB, 48dB, 56dB, and 66dB. This allows the phono stage to accommodate a wide range of cartridges with different output levels, from higher-output moving magnet models to lower-output moving coil designs. A dedicated MM\/MC impedance switch provides the appropriate input loading options, with 47kΩ for MM cartridges and 100Ω for MC cartridges. These controls make it easy to tailor the phono stage to compatible cartridges without replacing your entire turntable or audio system.\u003c\/p\u003e  \u003cp\u003eConnecting the Fosi Audio BOX X5 to your Hi-Fi system is straightforward. A stereo RCA input accepts the low-level phono signal from your turntable, while a separate stereo RCA output sends the equalized and amplified signal to a compatible line-level input on an integrated amplifier, preamplifier, or powered speaker system. A dedicated grounding terminal provides a convenient connection for the turntable's ground wire, helping minimize unwanted hum and interference. Its compact design also pairs naturally with other Fosi Audio components, including the V3 and ZA3 amplifiers, making it an excellent addition to a space-conscious vinyl listening setup.\u003c\/p\u003e  \u003cp\u003eThe BOX X5 is built around a durable aluminum alloy chassis that helps shield its sensitive phono circuitry from electromagnetic interference. Its minimalist design features a convenient front-panel power button and indicator light, while the rear panel provides access to the RCA connections, adjustable gain selector, cartridge impedance switch, and grounding terminal. Powered by an included 16V AC adapter, the BOX X5 offers straightforward installation without complicated setup menus or additional digital components. Whether you're adding phono capability to an amplifier without a dedicated turntable input or upgrading from a basic built-in phono stage, the Fosi Audio BOX X5 delivers versatile cartridge support, precision analog circuitry, and high-fidelity performance in one compact 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 BOX X5\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e MM\/MC phono preamplifier\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eAudio Channels:\u003c\/strong\u003e 2-channel stereo\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eSupported Cartridge Types:\u003c\/strong\u003e Moving Magnet (MM) and Moving Coil (MC)\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003ePhono Equalization:\u003c\/strong\u003e RIAA equalization\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eAmplification Circuit:\u003c\/strong\u003e Low-noise analog phono preamplifier\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eOperational Amplifier:\u003c\/strong\u003e Texas Instruments OPA1612\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eCapacitors:\u003c\/strong\u003e 2% precision polyester film capacitors and copper-lead audio capacitors\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eResistors:\u003c\/strong\u003e 0.1% high-precision film resistors\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eRCA Connections:\u003c\/strong\u003e Gold-plated RCA jacks\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eAvailable Gain Settings:\u003c\/strong\u003e 38dB, 48dB, 56dB, and 66dB\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003e38dB Gain:\u003c\/strong\u003e Recommended for phono signals above 2mV\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003e48dB Gain:\u003c\/strong\u003e Recommended for phono signals around 2mV or lower\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003e56dB Gain:\u003c\/strong\u003e Recommended for low-output phono signals around 0.5mV or lower\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003e66dB Gain:\u003c\/strong\u003e Recommended for very low-output phono signals around 0.25mV or lower\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eGain Adjustment:\u003c\/strong\u003e Four-position rear-panel rotary selector\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eCartridge Loading Selection:\u003c\/strong\u003e Dedicated MM\/MC impedance switch\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eMM Input Impedance:\u003c\/strong\u003e 47kΩ\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eMC Input Impedance:\u003c\/strong\u003e 100Ω\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eInput Loading Options:\u003c\/strong\u003e 47kΩ or 100Ω\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eTotal Audio Input Types:\u003c\/strong\u003e 1\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eAnalog Phono Input:\u003c\/strong\u003e 1 × stereo RCA pair\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eInput Signal:\u003c\/strong\u003e Low-level MM\/MC phono signal from a compatible turntable\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eTotal Audio Output Types:\u003c\/strong\u003e 1\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eAnalog Audio Output:\u003c\/strong\u003e 1 × stereo RCA pair\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eOutput Signal:\u003c\/strong\u003e RIAA-equalized, amplified analog audio for a compatible line-level input\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eOutput Impedance:\u003c\/strong\u003e 10kΩ, as listed in the manufacturer user manual\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eGround Connection:\u003c\/strong\u003e 1 × turntable grounding terminal\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eSignal-to-Noise Ratio:\u003c\/strong\u003e At least 92dB (38dB gain, 5mV input)\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eTotal Harmonic Distortion:\u003c\/strong\u003e 0.009% (38dB gain, 5mV input)\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eNoise Floor:\u003c\/strong\u003e 37µV (38dB gain, 5mV input)\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eFrequency Response:\u003c\/strong\u003e 20Hz–20kHz (±0.015dB)\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003ePower Button:\u003c\/strong\u003e Front-panel push-button control\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003ePower-On Operation:\u003c\/strong\u003e Press and hold approximately 2 seconds\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003ePower-Off Operation:\u003c\/strong\u003e Single press\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003ePower Indicator:\u003c\/strong\u003e Front-panel LED\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eVolume Control:\u003c\/strong\u003e No dedicated listening-volume control\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eChassis Material:\u003c\/strong\u003e Aluminum alloy\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eChassis Design:\u003c\/strong\u003e Compact metal enclosure with electromagnetic interference shielding\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Black\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 4.1 × 6.5 × 1.4 inches (manufacturer-listed)\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003ePower Input:\u003c\/strong\u003e AC 15–18V\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eIncluded Power Supply:\u003c\/strong\u003e 16V\/1A AC adapter\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003ePower Supply Type:\u003c\/strong\u003e External AC-output adapter; not a DC adapter\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\u003eBluetooth:\u003c\/strong\u003e No\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eWi-Fi:\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 Music Streaming:\u003c\/strong\u003e No\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eUSB Audio:\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\u003eHeadphone Output:\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\u003eDirect Passive Speaker Amplification:\u003c\/strong\u003e No\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eStereo Speaker Pairs Powered:\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\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\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e   \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio BOX X5 Phono Preamplifier, 16V AC 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\u003eVersatile MM and MC Cartridge Compatibility:\u003c\/strong\u003e Supports both moving magnet and moving coil cartridges, making it easy to integrate the BOX X5 with a wide range of compatible turntables and cartridge upgrades.\u003c\/li\u003e    \u003cli\u003e\n\u003cstrong\u003eFour Adjustable Gain Settings:\u003c\/strong\u003e Select 38dB, 48dB, 56dB, or 66dB of amplification to better match the output voltage of your turntable cartridge.\u003c\/li\u003e    \u003cli\u003e\n\u003cstrong\u003eAccurate RIAA Phono Equalization:\u003c\/strong\u003e Dedicated RIAA equalization circuitry restores the intended tonal balance of vinyl recordings for accurate, engaging analog playback.\u003c\/li\u003e    \u003cli\u003e\n\u003cstrong\u003ePremium Low-Noise Audio Components:\u003c\/strong\u003e An OPA1612 operational amplifier, precision film resistors and capacitors, and gold-plated RCA terminals help minimize unwanted noise and preserve musical detail.\u003c\/li\u003e    \u003cli\u003e\n\u003cstrong\u003eSimple Stereo System Integration:\u003c\/strong\u003e Dedicated RCA input and output connections, a turntable ground terminal, and rear-panel cartridge loading controls make installation straightforward.\u003c\/li\u003e    \u003cli\u003e\n\u003cstrong\u003eDurable All-Aluminum Construction:\u003c\/strong\u003e A compact aluminum alloy enclosure helps shield the sensitive phono circuitry from electromagnetic interference while complementing modern and traditional Hi-Fi systems.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is the Fosi Audio BOX X5 used for?\u003c\/strong\u003e\u003cbr\u003e A: The Fosi Audio BOX X5 is a dedicated phono preamplifier designed to amplify the low-level audio signal from a turntable cartridge and apply RIAA equalization. This creates a signal suitable for connection to a compatible line-level input on an integrated amplifier, preamplifier, or powered speaker system. It is especially useful for turntables and amplifiers that do not include a compatible built-in phono stage.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio BOX X5 support moving magnet and moving coil cartridges?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The BOX X5 supports both moving magnet (MM) and moving coil (MC) cartridges. It includes selectable input loading of 47kΩ for MM cartridges and 100Ω for compatible MC cartridges, along with four gain levels to accommodate different cartridge output voltages. Always verify the loading requirements of your specific cartridge.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What are the four gain settings on the Fosi Audio BOX X5?\u003c\/strong\u003e\u003cbr\u003e A: The BOX X5 features selectable gain settings of 38dB, 48dB, 56dB, and 66dB. Lower settings are typically used with higher-output cartridges, while higher settings accommodate lower-output designs. Fosi Audio recommends 38dB or 48dB with the 47kΩ MM loading setting and 56dB or 66dB with the 100Ω MC loading setting as starting points.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is RIAA equalization, and why does the BOX X5 need it?\u003c\/strong\u003e\u003cbr\u003e A: RIAA equalization is the standardized frequency correction used in vinyl playback. During record production, bass frequencies are reduced and high frequencies are increased to help optimize the recording process. The BOX X5 applies the complementary playback equalization curve to restore the intended tonal balance of the music while amplifying the cartridge's low-level signal.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: How many audio inputs and outputs does the Fosi Audio BOX X5 have?\u003c\/strong\u003e\u003cbr\u003e A: The BOX X5 has one stereo RCA phono input and one stereo RCA analog output. It also includes a separate grounding terminal for connecting the turntable's ground wire. It does not have digital audio inputs, headphone outputs, speaker binding posts, or balanced XLR connections.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I connect the Fosi Audio BOX X5 directly to powered speakers?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The BOX X5 can connect to compatible powered speakers with analog line-level inputs and their own volume control. It can also connect to an integrated amplifier or separate preamplifier. The BOX X5 cannot directly power passive speakers, and its output should connect to a line-level input rather than another phono input.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio BOX X5 support Bluetooth, Wi-Fi, or streaming music?\u003c\/strong\u003e\u003cbr\u003e A: No. The BOX X5 is a dedicated analog phono preamplifier and does not include Bluetooth, Wi-Fi, Apple AirPlay, or built-in music streaming services. It is specifically designed for playback from compatible turntables rather than digital audio sources.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What power supply does the Fosi Audio BOX X5 use?\u003c\/strong\u003e\u003cbr\u003e A: The BOX X5 uses an external 16V AC power adapter, which is included. Its supported input range is 15–18V AC. The unit requires an appropriate AC-output adapter and should not be powered using a conventional DC power supply.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887309213855,"sku":"FOS-BOXX5-BLK","price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/0e8c3adf-62d7-43fe-b321-15e1ed0058b7.jpg?v=1791574756","url":"https:\/\/listenup.com\/products\/fosi-audio-box-x5-mm-mc-phono-preamplifier-with-4-level-gain-adjustment","provider":"ListenUp","version":"1.0","type":"link"}