Boss Armor AR4000D 4000w Mono Car Audio Class D Power Amplifier+Remote+Amp Kit Max Power @ 1 Ohm 4000 Watts x 1 Max Power @ 2 Ohms 3000 Watts x 1 Max Power @ 2 Ohms, when strapped with same model amplifier: 8000 Watts RMS Power @ 4 Ohms 1600 Watts x 1 Amplifier Class: Class D