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The timing is mostly about age rather than generation here: this is a classic late-’80s/’90s-era brute, so value depends less on “newness” and more on condition and service history. At US$1,600, the asking price sits well above the recent market for this model; with a median of US$1,000 and a 75th percentile of US$1,250, this is ambitious unless the unit is exceptionally clean, fully serviced, and well documented.
That said, the M-504 is well regarded for its strong 165Wpc output, low distortion, and ability to drive demanding speakers with ease. If this one is original-owner, recently checked over, and includes the usual extras, there’s real upside for a fan of vintage Onkyo muscle. But at this price, you should want proof: no scratchy controls, no relay or protection issues, and ideally service records, because the premium only makes sense if it’s genuinely top-tier condition.
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.
