Boss CW350 Chaos Wired 400 Watt 4-Channel High Power Amplifier MAX POWER, 2 OHM, 100 Watts x 4 RMS POWER, 4 OHM, 50w x 4 SIGNAL-TO-NOISE RATIO, 90 dB; THD, 0.05% DIMENSIONS: 9-13/16-InchW x 2-5/16-InchH x 7-11/16-Inch