Good condition, tested and working. This little amp has muscle. The Denon PMA-520 excels with higher rated speakers producing stunning bass and crisp highs. Specs from online forums:
Power output: 70 watts per channel into 8Ω (stereo)
Frequency response: 20Hz to 20kHz
Total harmonic distortion: 0.015%
Input sensitivity: 0.2mV (MC), 2.5mV (MM), 150mV (line)
Signal to noise ratio: 68dB (MC), 88dB (MM), 105dB (line)
Output: 150mV (line)
Dimensions: 434 x 140 x 343mm
Weight: 7.4kg