Boss Audio CH850M 850 Watt Mono Chaos Amplifier. Max power: 850W x 1, 2 OHM. RMS power: 200W x 1, 4 OHM. RMS power: 400W x 1, 2 OHM. Signal-to-noise ratio 102 dB. THD 0.01%. Dimensions: 11-3/4" W x 2-11/16" H x 9-3/4" L. Includes remote subwoofer level...