Harman kardon Hk640

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Power output: 55 watts per channel into 8 (stereo)
Frequency response: 1Hz to 90kHz
Total harmonic distortion: 0.1%
Damping factor: 85
Input sensitivity: 0.13mV (MC), 2.4mV (MM), 140mV (line)
Signal to noise ratio: 75dB (MC), 79dB (MM), 84dB (line)
Channel separation: 65dB (MM), 65dB (MC), 60dB (line)
Speaker load impedance: 4 (minimum)
Dimensions: 443 x 134 x 359mm
Weight: 8.8kg