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Is US$850 a smart buy for this one, or just fair money for a cult-classic amp? Against the recent comp set, it lands essentially at the middle of the market: just above the US$825 median and still below the US$887 75th percentile, so this reads as a fair asking price rather than a bargain or an inflated ask.
That makes it interesting because the M-506RS is a respected piece in Onkyo’s better vintage solid-state era, valued for clean drive, strong build, and a presentation that can suit both revealing speakers and more relaxed vintage systems. At this level, the upside is in condition and originality: if it’s clean, unrestored in a good way, and comes with a solid history, it’s the kind of amp that can be a satisfying keeper.
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.
See all Onkyo listings on RADAR.
