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Onkyo M-504

Stereo Power Amplifier (1987-97)

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Onkyo M-504


Power output: 165 watts per channel into 8Ω (stereo)

Frequency response: 1Hz to 100kHz

Total harmonic distortion: 0.003%

Damping factor: 140

Input sensitivity: 1V

Signal to noise ratio: 120dB

Dimensions: 465 x 185 x 422mm

Weight: 22.5kg


service manual   English -

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Reviewed Dec 19th, 2014 by Uzrnaim

Cosmetically, this unit is absolutely stunning. Watching the big green meters dance is mesmerizing. The power is fantastic, it will pretty much drive any 4-8ohm speaker louder than is comfortable, with no notable distortion.



re: M-504

Specs say nothing of a 4 ohm load.

re: M-504

According to the 1987/88 catalogue the M-504 is rated at 250Wpc into 4 ohms, but this is at 1KHz, not the 20Hz to 20KHz of the 8 ohm rating.

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