Kicker 10ZX3504 4-Channel Amplifier 90W X 4 -A-B (Black) Two-, four-, mono-channel, & 5-channel hybrid for any configuration - Balanced differential inputs for noise elimination & factory-radio compatibility 3 automatic turn-on modes - +18dB of boost centered at 40 hertz - ZXRC remote capability on the 10 most powerful amps Optional end caps available KICKER Amp?s actual power always exceeds its rated power, documented inside each carton Optional vinyl skins for personalizing heat sinks available