Marine Amplifier M2 Series - 5 CHDesigned to withstand the elements, the R2 750X5 amplifier is an Element Ready 750 watt, full range class D model, capable of operating at 4 or 2 stereo, and 4 bridged mono with a subwoofer channel that can be run at 4 or 2. This amplifier is extremely efficient because of its class D technology which reduces demand on the electrical system. The amp also features C. L. E. A. N. circuitry to help you adjust your gain settings, a P. O. W. E. R. Supply