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Against the recent used market, US$1,200 sits a bit above the US$1,000 median and just over the US$1,213 75th percentile, so this is an upper-end ask but not a stretch if the unit is clean and fully sorted. It’s not a bargain at this number, but it’s close enough to fair that strong cosmetics, verified operation, and good service history could justify it.
The M-504 is well liked for its muscular, authoritative presentation and classic Onkyo build, so a healthy example still has real appeal for a vintage two-channel rig. At this price, the key upside is a well-kept amp with no channel imbalance, crackle, or protection issues; if the seller can confirm recent maintenance or original-owner care, that adds confidence.
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.
