Class D; 4 channels; 1,200W max; 100W RMS x 4 @ 4ohm ; 150W RMS x 4 @ 2ohm ; 300W RMS x 2 @ 4ohm bridged; MOSFET PWM power supply with Audiophile ; Military-grade SMT PCB maintains dynamic performance; 2ohm stereo & 4ohm bridged full-range operation; Direct short, thermal & overload circuits; 200mV-6V low-level RCA inputs; High-level input with signal-sense auto turn-on; Variable 12dB high-pass & low-pass crossovers; 10Hz-50Hz variable subsonic crossover protects subwoofer; Dim: 1.63″H x 9″W x 4.75″D;