Audiotek At804S 4 Channels Class Ab 2 Ohm Stable 1000W Stereo Power Car Amplifier Bridgeable MOSFET Amplifier | Tri-mode capable | 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