Sound Storm Laboratories AE125M AERO 2,500-Watt MOSFET Monoblock Amplifier with High/Low Crossover and Remote Subwoofer Level Control - Black/silver Two OHM stable Class AB monoblock Thermal, overload, and speaker short protection Remote Subwoofer level control MOSFET PWM (Pulse With Modulated) power supply Soft turn-on circuit