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At £909, this M5si is a strong deal against the recent used market: it sits exactly at the 25th-percentile point, below the £951 median and well under the £1,122 upper quartile. For a known, capable integrated amplifier, that is bargain territory rather than merely fair pricing, assuming it is fully functional.
The appeal is substantial power—150 watts per channel into 8 ohms—so it can comfortably handle demanding speakers, while its clean, controlled presentation, broad soundstage and taut bass make it an easy all-rounder. The built-in MM phono stage and asynchronous USB input add useful flexibility, and preamp/line outputs leave room for system expansion. Check that the remote, USB input, phono stage and speaker terminals all work, but there is no obvious pricing reason to hold back: at £909, this looks like a worthwhile buy.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Musical Fidelity, a British hi-fi icon, traces its roots to 1982 when clarinettist and audio enthusiast Antony Michaelson founded the company in London. Disillusioned with the sound quality of existing gear after his stint at predecessor Michaelson & Austin, he handcrafted his debut product—a minimalist preamplifier dubbed "The Preamp"—on his kitchen table. Paired with the quirky Dr. Thomas power amplifier, these designs disrupted the market with their bold aesthetics and sonic punch, establishing Michaelson’s experimental ethos from the outset.
The brand has long centered on amplifiers as its cornerstone, spanning integrated, power, phono, headphone, and preamp models renowned for Class-AB topology and innovative touches like Nuvistor tubes. It expanded into streaming players, DACs, CD players, Bluetooth receivers, all-in-one systems, and even headphones and turntables, always prioritizing musicality over convention. Unconventional industrial designs, from curved heatsinks to sculptural panels, became signatures, influencing competitors.
Positioned firmly in the high-end arena, Musical Fidelity commands respect among discerning audiophiles for its value-driven performance and soulful sound. Iconic models like the A1 and F-series endure as collector favorites, blending accessibility with premium engineering. Acquired by Austria’s Audio Tuning in 2018, it continues evolving under new stewardship while honoring its heritage as a boutique force in British hi-fi.
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