Boss OL5KD Outcast 5000 watt Class D Monoblock Amplifier MAX POWER, 1 OHM 5000W x 1; MAX POWER, 2 OHM 3500w x 1; RMS POWER, 4 OHM 2250w x 1 SIGNAL-TO-NOISE RATIO &gt; 100 dB; THD 0.01% DIMENSIONS: 11-5/16-InchW X 2-5/8-InchH X 17-1/8-InchL Remote subwoofer level control; RCA line outputs; Gain control; Input sensitivity selector; and Variable subsonic filter Variable low pass crossovers; 0 - +18 dB Bass Boost; Power and protection LEDs; and 0180 Variable phase shift control