Infinity K5 75W x 4 + 350W x 1 Car Amplifier 75 Watts RMS x 4 @ 4 ohm 100 Watts RMS x 4 @ 2 ohm 200 Watts RMS x 2 @ 4 ohm Bridged Subwoofer Channel: 4 ohms: 200 watts x 1 chan. 2 ohms: 350 watts x 1 chan.