Planet Audio TR4000.1D Torque 4000 Watt, 1 Ohm Stable Class D Monoblock Car Amplifier with Remote Subwoofer Control Pump out your tunes with the PLANET AUDIO Torque TR4000.1D monoblock class d amplifier. This powerful 1-Ohm stable amplifier features 4000 Watts Max power with a MOSFET power supply to Shift your audio experience up a Gear. Customize the sound with variable low pass Crossover, bass boost, subsonic filter and switchable phase control. Tweak the bass with the remote subwoofer control. For double the performance and power, strap on another TR4000.1D for a total power of 8000 Watts @2-ohms. Torque amplifiers are built to last and designed for those who can't resist cranking it up. Whatever your power and size need, there is a Torque amplifier to fit the bill. Drive the Beat up with the PLANET AUDIO TR4000.1D.