(Directly from Emotivas website....) Audiophile quality seven channel multi-channel power amplifier. Discrete, dual differential class AB amplifier topology with active current sources Six 125 watt channels of amplification (one channel configurable for two channel operation) Massive low noise toroidal power transformer Complementary, discrete power amplifier design incorporating high current, high speed, Toshiba power devices Channel status indicators for standby, operate, and fault Configurable power output as follows: 125 watts/8 ohms x 6 channels or 125 watts/8 ohms x 5 channels plus 2 x 50 watts/8 ohms x 2 channels Completely stable into 4 ohm loads Rated Power Output: Channels 1-5 (All Channels Driven at 0.04%THD, 120vAC/ 60HZ supply) 8 ohm: 125 watts / 4 ohm: 225 watts Channels 6-7 (All Channels Driven at 0.05%THD, 120vAC/ 60HZ supply) 8 ohm: 50 watts / 4 ohm: 95 watts Frequency Response: +/- 0.1 db: 20 to 20Khz, +/- 1.0 db: 10 to 100Khz Signal to Noise Ratio: (Un-weighted): >100db Distortion (THD, 80Khz bandwidth): Channels 1-5: 75db Power Requirements (All Channels Driven into 8 ohms): 1500 watts @ 120 volts AC, 60hz input Power Consumption: Standby: 4 watts, Idle: 46 watts Fully protected from all fault conditions Soft start circuitry External trigger turn on Soft touch power switch 5RU chassis w/ solid milled aluminum faceplate IEC power inlet, 120/230 VAC configurable L 17in W x 7.75 H x 19 Weight - 63 lbs.