Boss CW650 Chaos Wired 1000 Watt 4-Channel Mosfet Power Amplifier with Subwoofer Level Control MAX POWER, 2 OHM, 250 Watts x 4 RMS POWER, 4 OHM, 100 Watts x 4 MAX BRIDGED POWER, 4 OHM, 500 Watts x 2 SIGNAL-TO-NOISE RATIO, 102 dB; THD, 0.01% DIMENSIONS: 11-3/4-InchW X 2-11/16-InchH X 14-5/8-InchL