Soundstream SM1.700D 700W Max Monoblock Stealth Series Marine Grade Class D Amplifier RMS Power Rating: 4 ohms: 250 watts x 1chan. / 2 ohms: 350 watts x 1 chan. Peak power output: 700 watts MOSFET Power Supply w/ Audiophile Grade IRTM Transistors Military Grade SMT PCB Maintains Dynamic Performance Hybrid Aluminum Alloy Heat sink for Optimum Dissipation