Boss CX550 Chaos Exxtreme 800 Watts 2-Channel MOSFET Power Amplifier Amplifier Class: Class A/B Technology: MOSFET Number of Output Channels: 2 Total Power: 800 Watts Max Bridged Power @ 4 Ohms: 800 Watts x 1 Max Power @ 2 Ohms: 400 Watts x 2 RMS Power @ 4 Ohms: 125 Watts x 2 Frequency Response: 9 to 50000 Hz Total Harmonic Distortion (THD) @ RMS Output: 0.01% Minimum Speaker Impedance in Bridged Mode: 4 Ohms Signal-to-Noise Ratio (SNR): 102 dB Minimum Speaker Impedance: 2 Ohms Variable Low Pass Crossover: 35 to 160 Hz Dimensions: 2.46"" x 12.06"" x 11.81"" Bridgeable Soft Turn-On Circuit Thermal Overload & Speaker's Short Protection Remote Subwoofer Level Control Tri-Mode Operation Power & Protection LEDs Input Sensitivity Selector MAX POWER, 2 OHM 400w x 2; RMS POWER, 4 OHM 125w x 2; MAX BRIDGED POWER, 4 OHM 800w x 1 SIGNAL-TO-NOISE RATIO 102 dB; THD 0.01% DIMENSIONS: 11-7/8-InchW x 2-5/8-InchH x 12-3/16-InchL Trimode operation; Bridgeable; Remote subwoofer level control; Line and speaker level inputs; Variable gain control Power and protection LEDs; Variable lowpass and High pass crossovers; 0-+18dB variable bass boost; MOSFET power supply