Yamaha HTR-5440 Natural Sound 5.1 Channel Receiver / Home theater - Japan Power output: 65 watts per channel into 8 (stereo) Surround output: 65W (front), 65W (center), 65W (rear) Digital, Dolby Pro Logic, DTS, Cinema DSP, Tri-Field Processing. Frequency response: 20Hz to 20kHz Total harmonic distortion: 0.06% Damping factor: 60 Input sensitivity: 150mV (line) Signal to noise ratio: 100dB (line) Channel separation: 45dB (line) Output: 150mV (line) Speaker load impedance: 8 (minimum)