Pioneer GM-D8604 Class FD 4-Channel Bridgeable Amplifier Class FD 4-Channel Amplifier 4-channel car amplifier, 1,200 watts max power. Compact design for versatile installation options Extreme efficiency and high-quality sound 1 to 8 load impedance allowance () Continuous Power Output (1W,  1% THD+N) = 125 W x 4; Continuous Power Output (4W,  1% THD+N) = 100 W x 4