Boss CW250 Chaos Wired 400 Watt 2-Channel Mosfet Power Amplifier with Subwoofer Level Control MAX POWER, 2 OHM, 200 Watts x 2 RMS POWER, 4 OHM, 75 Watts x 2 MAX BRIDGED POWER, 4 OHM, 400 Watts x 1 SIGNAL-TO-NOISE RATIO, 102 dB; THD, 0.01% DIMENSIONS: 11-3/4-InchW X 2-11/16-InchH X 6-7/8-InchL