Alpine PDR-F50 4/3/2 Channel 500 Watt Amplifier 4-channel car amplifier 4-channel car amplifier  85 watts rms x 4 85 watts rms x 4 at 4 ohms (125 watts rms x 4 at 2 ohms) 250 watts rms x 2 in bridged mode (4-ohm stable in bridged mode) Cea-2006 compliant