Rockford Fosgate R2-500X4 Prime 4 Channel Class D Amplifier 4 x 75w RMSR2 500X4 Prime 500 Watt 4 Channel Amplifier Primed for Performance, the R2 500X4 is a 500 watt, full range Class D amplifier capable of operating at 4 or 2 stereo and 4 bridged mono. This amplifier is extremely efficient because of its Class D technology which reduces demand on the vehicles 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 that generates more power as