Sound Quality
Musical Fidelity has built its reputation on amplifiers that measure well, sound clean, and stay out of the way of the music. The M2si continues that tradition. Its tonal character is genuinely neutral — no artificial warmth, no treble brightness, just a transparent window into whatever you feed it. The noise floor is impressively low for the price, which means quiet passages retain their texture and detail rather than disappearing into amplifier hiss.
The 75 watts per channel is a meaningful step up from compact 50W designs, and the M2si uses that power headroom to maintain control and composure across dynamic peaks. Large orchestral swells and loud rock passages are handled without strain, and the bass response is tight and well-controlled. This is an amplifier that works well with a wide range of speakers, including some moderately demanding floor-standers that lower-powered alternatives struggle to control.
Where the M2si leaves room for desire is in the area of musical engagement. It is accurate, but it does not have the rhythmic drive of a Rega or the warmth of a Naim. Listeners who came to hi-fi through music rather than through specifications sometimes find it technically competent but emotionally restrained. For listeners who prioritize measurement-aligned neutrality and find more characterful amplifiers artificially colored, it is exactly right.
Build & Design
Musical Fidelity’s design language is clean, industrial, and purposeful. The M2si has a substantial aluminum front panel, a firm volume control, and a clean input selector that matches the brand’s premium presentation without excess ornamentation. The internal build is careful, with matched components and a well-regulated power supply. At 7.2kg, the chassis has a solidity that reflects real internal content rather than ballast.
The rear panel is logically organized with well-spaced input terminals that allow for easy cable routing. Speaker binding posts accept banana plugs, bare wire, or spades. The unit runs warm during sustained use, which is normal, and ventilation is handled adequately by the case design. No fan noise, no resonance — the M2si is a solid, quiet piece of equipment.
Value Proposition
At $649, the M2si is priced in a competitive segment. It offers more power than the Rega Brio at a lower price, and its neutral presentation is an asset for listeners who have identified and corrected room or speaker colorations and want an amplifier that does not add its own. The lack of a DAC is a genuine omission in 2026, requiring an additional purchase for digital sources, and the absence of an MC phono stage limits vinyl options to MM cartridges.
For listeners who already own an external DAC and phono stage and need a reliable, powerful amplifier with a clean sonic character, the M2si makes an excellent foundation. It is not the most exciting amplifier at its price, but it is one of the most dependable, and in a system built around exceptional speakers, that dependability allows the rest of the chain to do its work without interference.
