BOSS Audio CER450.4 Chaos Erupt  1800-watts Full Range Class A/B 4 Channel 2-8 Ohm Stable Amplifier with Remote Subwoofer Level Control Full-Range, Class A/B Topology MOSFET Power Supply 4/3/2 Channel Low and High Level Inputs Variable LP Crossover Full-Range, Class A/B Topology^MOSFET Power Supply^4/3/2 Channel^Low and High Level Inputs^Variable LP Crossover