Precision Power A900.1 900W Atom Series Monoblock Class D Car Amplifier RMS Power Rating: 4 ohms: 300 watts x 1 chan./2 ohms: 450 watts x 1 chan. MOSFET Power Supply w/Audiophile Grade IRTM Transistors Military Grade SMT PCB Maintains Dynamic Performance Hybrid Aluminum Alloy Heat sink for Optimum Dissipation Wired remote bass level control included