Fosi Audio MC331 Tube Integrated Bluetooth Amplifier with DAC and VU Meter

1-Year Official Warranty by Fosi Audio Malaysia

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Fosi Audio MC331 Tube Integrated Bluetooth Amplifier with DAC and VU Meter

[ DESCRIPTION ]

 

The Fosi Audio MC331 is a compact hybrid tube amplifier that combines the warm sound of vacuum tubes with solid-state power, delivering high-fidelity audio for passive speakers with support for Bluetooth, optical, and analog inputs.

 

[ SPECIFICATIONS ]

 

MAX Power Output: 105W×2@4Ω

Input Mode: Bluetooth +RCA +USB +COA+OPT

Output Mode: Passive Speakers Output, Pre-Out, 3.5mm Headphone Output

THD: ≤0.03%

SNR: ≥100dB

Device Dimension: 10 x 2 x 2.7 inches

Terminating Impedance: 4-8 Ohm

Power Supply: 24V/4.5A

 

[ FAQ ]

 

What kind of speakers can I use with the MC331?

➤ You can use passive speakers with an impedance of 4–8 ohms. It’s great for bookshelf or small tower speakers.

 

Does the MC331 support Bluetooth?

➤ Yes, it has Bluetooth 5.0 with support for SBC and AAC audio codecs. It's perfect for streaming from phones, tablets, or laptops.

 

Can I connect a TV or media streamer to it?

➤ Yes — you can use the optical (Toslink) input for TVs and streamers that support PCM stereo output.

 

What are the input options?

➤ Optical (Toslink), RCA (analog), Bluetooth 5.0

 

Does the MC331 work with a soundbar?

➤ Not directly. It doesn’t have a digital output to connect to a soundbar. It's made to drive passive speakers, not work with powered soundbars.

 

What tubes does the MC331 use? Can I swap them?

➤ It comes with 6K4 tubes (preamp tubes). Yes, they are user-replaceable, and you can tube roll with compatible types like 6AK5, 5654, or EF95.

 

Can I use headphones with the MC331?

➤ No, it doesn’t have a headphone output. It’s meant for speaker output only.

 

What is the pre-out jack used for?

➤ The 3.5mm pre-out sends an unamplified analog signal — good for connecting to a subwoofer or external amplifier (not a digital soundbar).

 

What’s the power output?

➤ It outputs 50W per channel at 4Ω and 32W per channel at 8Ω — enough for most nearfield or small-room setups.

 

Is the MC331 good for music?

➤ Yes — its hybrid tube+solid-state design gives a warm, smooth sound ideal for hi-fi music listening, especially with vocal, jazz, or acoustic genres.