Fosi Audio MC331 Tube Integrated Amplifier with DAC

The Fosi Audio MC331 brings multiple audio components into one compact desktop amplifier for listeners who want simple switching, speaker power, headphone output, and tube character without building a stack of separate gear. It combines a DAC, amplifier, preamplifier, and headphone amplifier in one chassis, making it a practical centerpiece for a computer desk, bookshelf speaker system, TV audio setup, or compact listening room.

Flexible Source Connections

The MC331 supports Bluetooth, RCA, USB, optical, and coaxial inputs, so it can connect with common digital and analog sources. Use Bluetooth for wireless playback from a phone or tablet, USB for a computer, optical or coaxial for compatible digital sources, or RCA for analog components such as a turntable with a built-in phono preamp. Input switching helps the amplifier serve as a convenient hub instead of forcing users to reconnect cables between listening sessions.

Speaker, Headphone, and Preamp Output

For passive bookshelf speakers, the MC331 provides speaker terminal output with a maximum power rating of 105W x 2 at 4 Ohm. A 3.5mm headphone output supports private listening, while the pre out gives users a way to expand into a 2.1-style setup with compatible powered equipment. This makes the amplifier useful for both nearfield desktop listening and compact room audio systems.

Tube Style with Everyday Control

The visible JAN 5654W vacuum tubes and mini VU meter give the MC331 a retro audio look while keeping the controls simple. Bass and treble adjustment let users shape the sound for their room, speakers, or headphones, and the included remote control allows adjustments from the listening position. The all-metal CNC integrated case helps the amplifier feel purpose-built for display on a desk, shelf, or media console.

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Amplifier Performance

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Tubes

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Power

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