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At US$1,350, this Onkyo M-504 is ambitiously priced, sitting clearly above the 75th percentile of US$1,300 from eight recent comparable listings where the median is US$1,050. While the Integra M-504 is a respected 100W vintage stereo power amplifier known for robust build and clean, uncolored sound from its 1987–1997 run, the asking price exceeds what most buyers have paid recently.
This unit becomes a worthwhile buy only if it’s in original-owner condition with no repairs, includes the original P-304 preamp or T-4087 tuner, and features upgraded internals like LEDs or fresh caps. At US$1,350, it’s not a bargain, but if it’s truly pristine and fully accessorized, it could still be a fair opportunity for a collector seeking a top-tier vintage Onkyo power amp without hunting for deals.
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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