Pioneer GM-D9705 GM Series 2,000-Watt 5-Channel Class D Amp 124 out of 5 Stars. 12 reviews Rockford Fosgate R2-500X4 Prime 500-Watt Full Range 4-Channel Amplifier, Black Add $329.99current price $329.99 $66.40/lbRockford Fosgate R2-500X4 Prime 500-Watt Full ...