Boss D1800.5 Diablo 5-Channel Mosfet Bridgeable Power Amplifier MAX POWER, 2 OHM 300w x 4 + 600w x 1; RMS POWER, 4 OHM 120w x 4 + 200w x 1; MAX BRIDGED POWER, 4 OHM 600w x 2 + 600w x 1 DIMENSIONS: 11-InchW x 2-5/16-InchH x 18-3/4-InchL; Trimode operation; Bridgeable; MOSFET power supply Remote subwoofer level control; Line and speaker level inputs; Variable bass boost 0 to +18dB Variable low pass crossover; High pass crossover (fixed) Input gain control and Power and protection LEDs