Planet Audio BBD4000 Big Bang Series Car Audio Amplifier - 4000 High Output Monoblock Class D 1 Ohm Low Level Inputs Low Pass Crossover Mosfet Power Supply Hook Up To Stereo and Subwoofer Planet Audio BBD4000 Class D Car Amplifier – 4000 Watts 1 Ohm Stable Digital Monoblock MOSFET Power Supply Boost the power behind your bass with the Planet Audio BBD4000 Monoblock class D amplifier. With 4000 high output max power and MOSFET power supply this amplifier offers stable powerful bass at 1 Ohm Customize the sound with variable low pass crossover variable bass boost variable subsonic filter phase control and remote subwoofer control. Strap this amplifier to another BBD4000 for double the performance and power.