Kenwood made their reputation building car amplifiers that offer no-nonsense reliability and superior sound quality. The compact KAC-8404 4-channel amplifier features a rugged cast-aluminum chassis more than 40% smaller than its predecessor, yet it'll still pump out 50 watts RMS to each of 4 channels � ideal for improving the performance of the front and rear speakers in your system. Or, you can bridge the amp to 2-channel mode and drive a couple of subs with 180 watts RMS each without straining your car's electrical system.