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 type of tubes does the Fosi Audio MC331 use?

➤ The MC331 uses 6K4 vacuum tubes, which can be upgraded or swapped with compatible alternatives to customize sound characteristics.

 

Can I use the MC331 as a DAC for my computer?

➤ Yes, it features a USB DAC input, allowing direct connection to a PC or Mac via USB, effectively acting as an external sound card.

 

Does the MC331 support Bluetooth audio input?

➤ Yes, the MC331 supports Bluetooth 5.0 for wireless streaming from smartphones, tablets, or other Bluetooth-enabled devices.

 

What is the power output of the amplifier?

➤ The MC331 delivers up to 50W per channel at 4 ohms, which is sufficient for most bookshelf or desktop speakers.

 

What inputs and outputs are available on the MC331?

➤ Inputs: RCA, USB, Bluetooth, and AUX

➤ Outputs: Speaker binding posts and a 3.5mm headphone jack (depending on model version)

 

Are the VU meters functional or decorative?

➤ The VU meters are functional and respond to the audio signal, providing a visual representation of volume levels/output.

 

Can I connect a subwoofer to this amplifier?

➤ No dedicated sub-out is available, but you can connect a powered subwoofer using speaker-level inputs if your sub supports that.

 

Is this amplifier suitable for high-impedance headphones?

➤ It depends on the model version — if it includes a headphone output, it's best suited for low to medium impedance headphones (under 150 ohms).

 

Does it have a remote control?

➤ The MC331 does not typically include a remote control, but Bluetooth volume can be adjusted from the connected device.

 

Is tube rolling (tube replacement) supported?

➤ Yes, users can replace the 6K4 tubes with compatible alternatives like GE5654, 6J1, 6AK5, etc., for tone customization.