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A new high-power Onkyo integrated/amp at this level would have sat well above this, so US$850 for a used M-508 looks like a strong bargain versus the recent market: it’s below the US$1,200 25th percentile and far under the US$1,800 median. That’s the kind of pricing that should get an enthusiast’s attention quickly, especially for a serious amplifier known for brute-force drive and a very substantial, old-school build.
The M-508’s appeal is simple: lots of clean power, good control with difficult speakers, and a cult following among vintage Onkyo fans who want real heft without stepping into esoteric pricing. At this number, a tidy, working example is a buy-now proposition; just confirm it powers up correctly, channels are stable, and the seller can speak to service history, since age-related maintenance matters more than cosmetic perfection on gear like this.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Onkyo traces its roots to postwar Japan, founded in 1946 in Osaka by Takeshi Goda, an engineer at Matsushita Electric who envisioned high-quality Japanese loudspeakers. Initially established as Osaka Denki Onkyo K.K., the company began production in 1948 with the acclaimed ED-100 speaker featuring a 25 cm driver, quickly building a reputation through LP concerts and innovative designs that resonated with audiophiles.
The brand excels in premium home audio, renowned for AV receivers, hi-fi amplifiers, and surround sound speakers that deliver exceptional clarity and power. Its portfolio spans turntables, DACs, headphones, and cables, bolstered by acquisitions like Pioneer's home electronics division in 2015, enabling cutting-edge integrations such as internet radio and high-resolution streaming.
Onkyo holds a solid mid-tier position in the hi-fi market, prized by discerning buyers for reliable performance and value rather than ultra-high-end exotica. Despite bankruptcy challenges in the late 2010s, its revival under new ownership preserves a legacy of technological innovation and pure sound enjoyment, appealing to both vintage enthusiasts and modern home cinema setups.
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