Autotek 4000 Watt Mono Amplifier Class D 1 Ohm Monoblock Car Amp | MMA4000.1D Autotek MMA4000.1D 4000 Watt Class D Amplifier 1 Ohm: 4000 Watts x 1 Channel 2 Ohm: 2000 Watts x 1 Channel 4 Ohm: 1000 Watts x 1 Channel Frequency Response: 15Hz-250Hz