Denon PMA-550 Stereo Integrated Amplifier (1980) Power output: Min.RMS 100 watts per channel into 8 ohms (stereo). Min. RMS 140 watts per channel into 4 ohms (stereo).Total harmonic distortion: 0.005%

Denon PMA-550  Stereo Integrated Amplifier (1980) Power output: Min.RMS 100 watts per channel into 8 ohms (stereo). Min. RMS 140 watts per channel into 4 ohms (stereo).Total harmonic distortion: 0.005%