Description
Product Overview
The Fosi Audio MC331 is an all‑in‑one DAC amp that merges a digital‑to‑analog converter, tube preamplifier, line‑level pre‑out, and headphone amplifier into a single, space‑saving chassis. Housed in a sleek aluminum enclosure measuring 5.94 x 5.31 x 1.97 inches and weighing just 4 pounds, the unit delivers a maximum output of 105 W per channel into 4 Ω loads, making it powerful enough for bookshelf speakers while remaining compact for desktop use. Featuring a replaceable 5725W vacuum tube and an integrated VU meter, the MC331 offers both visual appeal and the warm harmonic richness associated with tube amplification. Connectivity options include Bluetooth 5.0, USB‑type‑C, coaxial, optical, and RCA inputs, as well as a 3.5 mm headphone jack and a dedicated pre‑out for external power amplifiers.
Usage
Designed for audiophiles, home office setups, and multimedia enthusiasts, the MC331 fits seamlessly into any listening environment. Whether you are streaming high‑resolution music from a smartphone via Bluetooth, playing lossless files from a computer through USB, or enjoying vinyl records on a turntable with a built‑in phono preamp, the unit provides versatile input selection. Its remote control allows you to adjust bass, treble, and volume without leaving your chair, making it ideal for long listening sessions, gaming rigs, or small‑room home theater configurations. 
Why Choose Us
Fosi Audio’s reputation for engineering excellence is reflected in the MC331’s meticulous design and rigorous quality testing. The combination of solid‑state circuitry with a vacuum tube stage delivers a unique sonic signature that balances precision and warmth. Each unit undergoes a 12‑hour burn‑in and acoustic calibration to ensure consistent performance. The modular tube design lets users experiment with different tubes to tailor the tonal character, while the robust aluminum chassis provides durability and effective heat dissipation.
Key Features
- All‑in‑one DAC, tube preamp, line‑out, and headphone amp in a compact desktop form factor
- Multiple inputs: Bluetooth 5.0, USB‑C, coaxial, optical, RCA, and 3.5 mm headphone jack
- Powerful 105 W × 2 output at 4 Ω, capable of driving most bookshelf speakers
- Replaceable 5725W vacuum tube with integrated VU meter for visual feedback
- Remote control with bass, treble, and volume adjustments for convenient operation
FAQ
Can I use the MC331 with a turntable?
Yes. Connect the turntable’s built‑in phono preamp to the RCA inputs, or use the MC331’s line‑out to feed an external power amp if desired.
What Bluetooth codecs are supported?
The unit supports aptX, AAC, and SBC, ensuring high‑quality wireless streaming from compatible devices.
Is the tube replaceable by the user?
Absolutely. The front panel provides easy access to the 5725W tube, allowing users to swap it without tools for tonal customization.
Does the MC331 include a headphone amplifier?
Yes, a dedicated 3.5 mm headphone output delivers up to 1 W into 32 Ω loads, suitable for most high‑impedance headphones.
What is the warranty period?
Fosi Audio offers a two‑year limited warranty covering manufacturing defects and component failures.
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