BOSS AUDIO CXX354 Chaos Exxtreme II 400-Watt Full Range, Class A/B 2-8 Ohm Stable 4 Channel Amplifier (Discontinued by Manufacturer) 400 W MAX Power, 4 Channel75 W X 4 RMS @ 2 ohm38 W X 4 RMS @ 4 ohm Full Range, Class A/B, High and Low Level Inputs 6 Year Platinum Dealer Warranty