TECHNICS SA-8500X 2 or 4 channel (Quatro) 80W / 28W per channel resp. This receiver is very rare and is the much larger version of the Technics SA-8000X, which in contrast is offered on a regular basis on the internet. Specifications: Transmitter range: FM, MW Output power 80W/per channel (stereo) with 2 channel use At 4 channels (quadraphonic): 28 W per channel Frequency range: 7Hz to 70kHz Total harmonic distortion: 0.5% Damping factor: 20 Input selectivity: 2mV (MM), 180mV (line) Signal to noise ratio: 70dB (MM), 90dB (line) output: 180mV (line) Speaker impedance: 4Ω to 16Ω Weight: 17 kg Dimensions: 54x35x16 (w x d x h)