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Versus a typical mid-tier integrated at this money, this is sitting right around the sweet spot: £976 lands just above the £950 median and well below the £1,161 upper quartile, so it reads as a fair-to-good buy rather than a stretch. It is not a bargain-bin score, but it is priced closely enough to the centre of the used market that a clean example can be easy to justify.
The M5si has the kind of muscular, composed presentation that keeps it popular with enthusiasts: plenty of drive, solid grip on speakers, and enough refinement to work in a serious two-channel system without fuss. If the unit is genuinely tidy and complete, the main upside is getting a well-regarded, high-current integrated without paying top-of-market money; at this price, condition and provenance matter more than hunting for hidden faults.
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.
See all Musical Fidelity listings on RADAR.
