Musical Fidelity M5si Integrated Amplifier [2nd hand]

The M5si is an integrated amplifier that delivers an exceptionally clear, clean, and detailed sound, with a wide stereo image and impressive depth. The bass is solid, accurate, and always well controlled, while the high frequencies are rich in detail and smooth to listen to.

According to numerous professional reviews, the M5si combines tonal balance, excellent detail retrieval, strong dynamics, and robust build quality. It is regarded as a complete amplifier, capable of reproducing music with naturalness, precision, energy, and an expansive soundstage. Its performance is also praised for its smooth, neutral presentation and lack of harshness, providing an engaging yet highly controlled listening experience.

With an output of 150 watts per channel and high current capability, the M5si can drive virtually any loudspeaker with ease.

Internally, it is designed as two independent power amplifier sections paired with a dedicated preamplifier stage, all integrated onto a single circuit board. Its technical performance is very close to that of the M6si.

The M5si features extremely low distortion, an excellent signal-to-noise ratio, and a remarkably flat frequency response. It includes an MM phono input, four line-level inputs, and a USB Type-B input supporting signals up to 24-bit/96 kHz.

The M5si stands out for its clarity, natural presentation, and effortless musicality. Developed after the acclaimed Nu-Vista 800, it incorporates several circuit design solutions derived from that flagship model.

It produces a wide and deep soundstage, extended and well-controlled bass, and detailed yet smooth high frequencies with no trace of harshness.

Key Features

• 150 watts per channel output.
• Outstanding technical performance.
• Variable preamplifier output.
• Excellent stability and the ability to drive virtually any loudspeaker.
• Comprehensive connectivity, including asynchronous USB and MM phono input.
• Robust, high-quality construction.

Technical Specifications

Amplifier

Power output: 150 watts per channel into 8 ohms.

Total harmonic distortion (THD + noise): less than 0.010% from 20 Hz to 20 kHz.

Signal-to-noise ratio: greater than 100 dB (A-weighted).

Frequency response: 10 Hz to 20 kHz (+0 / -0.1 dB).

Inputs

4 RCA line-level inputs.

1 USB Type-B input with asynchronous data transfer, supporting signals up to 24-bit/96 kHz.

1 MM phono input.

1 trigger input.

Phono Input

Sensitivity: 3 mV (MM).

Signal-to-noise ratio: greater than 70 dB (A-weighted).

Input impedance: 50 kΩ (MM).

Frequency response: RIAA/IEC equalization, ±0.5 dB from 20 Hz to 20 kHz.

Outputs

1 trigger output.

1 fixed line-level output.

1 variable preamplifier output.

General

Dimensions (W × H × D): 440 × 100 × 405 mm.

Weight: 14.6 kg (net), 18.8 kg (packed).