POWER ACOUSTIK GT4-1800 Gothic Four Channel Amplifier Plays Dual Stereo or 2 CH Bridged Mono 2-Ohm Stereo/4-ohm Bridged Stable Class A/B Regulated PWM MOSFET Power Supply High Level Input w/ Signal Sense - Input for your Factory Radio! Variable 0-12dB 45Hz Bass Boost. 4ga Power/Ground & 8ga Speaker Terminals