Power Acoustik CPT4-800 4 Channel 800 Watt MOSFET  2-ohm Stereo, 4-ohm Bridged  Tri-Mode Capable with Selectable 45Hz, 6/12dB Bass Boost 2-ohm Stereo, 4-ohm Bridged Stable Class A/B Selectable 45Hz, 6/12dB Bass Boost Tri-Mode Capable Variable 12dB 50-250Hz HPF MOSFET PSU Transistors Regulated PWM Power Supply Three-Way Protection Circuitry (short, thermal & overload) Pre-Amp Outputs 200mV-8V Low Level Inputs