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This looks like a fair ask, sitting just below the £512 median and well within the recent £218–£617 comparable range. It is not the bargain end of the market, but £500 is defensible for a confirmed, working S21MI in good condition; the unknown condition is the main reason not to call it exceptional value.
The appeal is substantial power and current delivery—around 175 watts per channel into 8 ohms—alongside a notably dynamic, rhythmically assured presentation. These older AVI amplifiers have a loyal following for driving demanding speakers without sounding coarse, and their relatively uncommon status adds interest. Before buying, confirm the exact variant, especially whether the phono stage is fitted, and check that the remote, input selection, balance, and both channels work quietly. At this price, a clean example with accessories is worth serious consideration.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Monitor Audio, a British hi-fi mainstay, traces its origins to 1972 when founder Mo Iqbal established the company in a modest factory near Cambridge, England. Starting with hands-on loudspeaker assembly in a garage-like setting, it quickly professionalized, moving to Rayleigh, Essex, in 1976 for in-house manufacturing. This heritage of meticulous British engineering has endured through expansions, including a 2004 shift of production to China while retaining design leadership in Essex, alongside strategic acquisitions like Roksan in 2016 and Blok in 2019.
The brand excels in loudspeakers across diverse categories, from high-fidelity two-channel stereo models to advanced home cinema systems, architectural installations, outdoor speakers, and lifestyle solutions. Signature innovations like the patented C-CAM Gold Dome tweeters, introduced in the 1980s and continually refined, define its sound. Complementing these are amplifiers, streamers, and integrated audio systems, reflecting a broad portfolio that prioritizes proprietary driver technologies and precise enclosure design over peripheral gear like turntables or headphones.
Positioned as a mid-to-high-end powerhouse, Monitor Audio commands respect for delivering audiophile-grade performance at accessible price points, blending relentless innovation with timeless British craftsmanship. Over five decades, it has solidified its status as a global juggernaut, appealing to discerning buyers seeking refined, dynamic sound without boutique exclusivity or vintage nostalgia.
See all Monitor Audio listings on RADAR.
