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The Onkyo M-504 is a revered vintage solid-state amplifier from the Integra era, famous for its 165 watts per channel and iconic green VU meter glow. At US$860, this listing is a strong bargain, sitting well below the 25th percentile of US$961 and significantly under the median of US$1,050 from your recent comparable database. This price represents genuine value for a model that originally retailed for US$900 and is now seeing rising demand among collectors.
This unit is a worthwhile buy because the M-504 delivers massive, clean power with a damping factor of 140, making it ideal for driving difficult speakers. The combination of its robust build, long production run from 1987 to 1997, and that distinctive meter visual makes it a standout piece in any vintage rack. Since the price is well below market median, you can afford to be slightly more flexible on condition or missing accessories, treating this as a clear buying opportunity rather than a risky gamble.
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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