FOSI AUDIO MC351

The MC351 is a 2.1-channel integrated amplifier that combines the classic charm of vintage aesthetics with the versatility of modern technology. Equipped with a built-in DAC, it supports four types of digital inputs — Bluetooth, USB, optical, and coaxial — ensuring broad compatibility with a variety of audio sources. The inclusion of both passive subwoofer and pre-out outputs allows for easy configuration of stereo or 2.1 systems, offering great flexibility for home Hi-Fi setups as well as small home theater installations.

Power is delivered by two Texas Instruments TPA3255 Class D amplifier chips, capable of producing up to 165 watts per channel plus 350 watts for the subwoofer at 4 ohms, while maintaining harmonic distortion below 0.03% and a signal-to-noise ratio above 100 dB. Its dual-PCBA design separates input and output circuits to eliminate interference, resulting in pure, detailed, and stable sound reproduction.

Aesthetically, the large circular VU meter pays homage to the retro design of classic analog amplifiers. The dancing needle that moves in time with the music adds an elegant and nostalgic visual touch, evoking the golden age of Hi-Fi.

The MC351 also stands out for its user-friendly functionality. A single button allows for quick switching between five input modes, while bass and treble tone controls let users easily tailor the sound to their preferences. The automatic standby feature, which activates after two minutes of inactivity, helps reduce power consumption and extend the device’s lifespan. Two large 4700 μF capacitors further enhance dynamic range and sound stability, ensuring consistent performance over time.

Compact, powerful, and refined, the MC351 perfectly blends innovation and tradition, designed for enthusiasts who wish to rediscover the pleasure of analog listening with the convenience of modern digital technology.

Technical Specifications:

• Product type: Integrated amplifier
• Amplification type: Class D
• Channels: 2.1
• Amplification chip: Texas Instruments TPA3255
• Inputs: 1 x analog RCA stereo; 1 x USB-C; 1 x coaxial SPDIF; 1 x optical Toslink; Bluetooth
• Outputs: speaker terminals; 1 x passive subwoofer output (terminal block); 1 x pre-out (3.5 mm jack)
• Output power: 2 x 165 W @ 4 Ω
• Subwoofer output power: 350 W @ 4 Ω
• Subwoofer output frequency: 20 Hz – 250 Hz
• Load impedance: 4–8 Ω
• Frequency response: 20 Hz – 20 kHz (±0.1 dB)
• Total harmonic distortion (THD): ≤0.03%
• Signal-to-noise ratio (SNR): ≥100 dB
• Supported sampling rates: USB 24-bit/96 kHz; Toslink optical and SPDIF coaxial 24-bit/192 kHz
• Bluetooth standard: 5.3
• Supported Bluetooth codecs: SBC and AAC
• Bluetooth range: 10 m (obstacle-free)
• Tone controls: bass and treble
• Dimensions (W x D x H): 330.6 x 228.6 x 76.2 mm
• Weight: approx. 1 kg