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The Onkyo M-5140 is a respected 90s Japanese stereo power amp known for delivering 105 watts per channel with remarkably low distortion (0.09%) and a wide 5Hz–100kHz frequency response. At US$190, this asking price sits right at the median of the current used market (median US$190, 25th percentile US$170, 75th percentile US$278 based on three recent listings), making it a fair and straightforward deal for a tested unit.
This amplifier pairs ideally with the Onkyo P-3160 preamp and offers clean, stable power for demanding speakers without the noise or heat of cheaper modern alternatives. Since the price is fair and not ambitious, the main upside is securing a well-built, original-owner piece of vintage hi-fi that still performs like new; if the listing includes the original manual or shows minimal cosmetic wear, it becomes a solid buying opportunity for enthusiasts seeking reliable vintage power.
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.
