Nakamichi AV-1S 910W Tuning range: FM, MW Power output: 100 watts per channel into 8Ω (stereo) Surround output: 100W (front), 50W (center), 30W (rear) Frequency response: 10Hz to 70kHz Total harmonic distortion: 0.1% Input sensitivity: 2.5mV (MM), 150mV (line) Signal to noise ratio: 76dB (line) Speaker load impedance: 4Ω to 16Ω Video Connections: composite, S-video Dimensions: 432 x 135 x 375mm Weight: 13.9kg A+B Speakers ( four main speakers can be connected ) Loudness Subwoofer out Auto cooling fan