POWER ACOUSTIK D1-4000DB Demon 4000 Watt 1 Ohm Mono Amplifier - Black MOSFET Power Supply with Pulse Width Modulated circuitry make up each DEMON amplifiers power supply. MOSFET transistors increase durability and longevity over bi-polar counterparts. DEMON amplifiers feature an 18dB 45Hz parametric bass boost. Variable boost level adjustment with the included remote gain control allows level adjustment from a remote location in the vehicle. Get double 1 ohm power on a 2 ohm load by strapping two like DEMON Class D amps together. All pre-amp adjustments and remote control are done from one Master amp. 1-Ohm Stable Class D Monoblocks, 200mV-6V Low Level Inputs, Tri-Mode Capable, Three-Way Protection Circuitry, 4 ga. Power & 8 ga. Speaker Terminals, Regulated Power Supply 180 Degree Phase Switch let you maximize the bass in the vehicle.