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This is a buyer’s market for the Onkyo M-504 right now, and the US$1,100 asking price sits just below the 75th percentile of US$1,163, making it fair but slightly ambitious compared to the median of US$1,000. While some external sources suggest used values around US$300–US$400, the GROUND TRUTH data from recent comparable listings anchors the realistic market higher, so this price isn’t a bargain but remains reasonable for a well-maintained unit.
The Onkyo Integra M-504 is a legendary 165W solid-state power amplifier, prized for its 50-pound build, clean sound, and long 1987–1997 production run. It delivers robust, uncolored power ideal for demanding speakers, and models like this are often called “hidden vintage gems” on the resale market. At US$1,100, if the amplifier is recently serviced and includes original accessories, it’s a worthwhile buy for enthusiasts seeking vintage reliability and performance without the risk of unknown failure points.
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.
