Planet Audio PL4000.1D Pulse Series Car Audio Amplifier – 4000 High Output, Monoblock, Class D, 1 Ohm Stable, Low Level Inputs, Low Pass Crossover, Mosfet Power Supply, Hook Up To Stereo and Subwoofer Planet Audio PL4000.1D Pulse 4000 Watt, 1 Ohm Stable Class D Monoblock Car Amplifier with Remote Subwoofer Control Enjoy superior stability and sound with the Planet Audio Pulse PL4000.1D Monoblock Class D Amplifier. With 4000 Watts Max Power and MOSFET power supply, this Amplifier offers stable, powerful Bass for your playlists. Customize the sound with Variable Low Pass Crossover, Bass Boost, Subsonic Filter, Phase Control and Remote Subwoofer Control. Strap this Amplifier to another PL4000.1D for double the performance. When space is limited but your passion for great sound is not, Pulse Amplifiers with blue illuminated end panel strips and logo are just what the doctor ordered to power up your music and get your heartbeat racing. Power - 4000 Max x 1 @1-Ohm, 2000 Max x 1 @2-Ohms, 1000 Max x 1 @4-Ohms, 8000 Max x 1 @2-Ohms strapped. Class D - Power loss is significantly reduced making the amplifier highly efficient. Excess energy is stored until it’s needed instead of being converted into heat. Reduction in size/weight, reduced power waste, smaller heat sink, compact circuitry 1 Ohm Stable - The PL4000.1D is able to continuously power loads of 1 Ohm without encountering difficulties such as overheating. Typically made to power up subwoofers that demand the heavier power load requirements to be able to perform the way they were made to MOSFET Power Supply - A MOSFET is an electrical switch that allows the flow of electrical current. It controls the output voltage and current precisely by removing the output current sensing loss & eliminating all secondary feedback circuitry.