Audiotek At810M Class Ab 1 Channel Mono 2 Ohm Stable 1200W Stereo Power Car Amplifier W/Bass Control Heavy-Duty aluminum alloy heat sink Class A-B Operation | Continuously- Variable low pass crossover: 0 to +18dB | Remote Subwoofer control Continuously-Variable input gain control | Fixed high pass crossover: 200Hz Nickel Plated RCA and Speaker level inputs | Remote turn-on/turn-off circuit | MOSFET pulse width modulated power supply Thermal and Speaker Short protection Circuitry | LED Power and protection indicators