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What should you be asking yourself first: is this below-market enough to move now, and on the comps, yes—it lands under the 25th percentile. With a median of US$438, a 25th percentile of US$387, and an asking price of US$312, this reads as a strong deal rather than a merely fair one.
That makes it appealing for a buyer who wants a respected vintage preamp without paying near-top-of-market money. The P-304 is the kind of Onkyo piece people buy for solid analog control, good build, and an easy fit into a classic system; at this price, the upside is real if it’s complete and functioning properly. I’d still verify basic operation, since age can expose noisy controls or tired switches, but the pricing leaves room for a little service and still keeps it attractive.
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.
