{"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","url":"https:\/\/listenup.com\/products\/fosi-audio-mc331-tube-integrated-amplifier-with-dac-bluetooth","provider":"ListenUp","version":"1.0","type":"link"}