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This Soundstorm Laboratories (SSL) EVO4000.1 Class D monoblock amplifier is perfect for your car audio setup. It is stable at 1 ohms and produces 4000 watts RMS at 1 ohm. Class D is a high speed switching amplifier technology that is more efficient, generates less heat and draws less power than traditional Class A/B amps. We use Class D in our monoblock amplifiers to give you massive amounts of power in a relatively small footprint for clean, powerful, bass. The lowest impedance accepted by this amplifier is 1 ohm. Amplifiers that are 1 ohm stable produce the most power possible from the amp. An amplifier capable of delivering power at a 1 ohm load is usually reserved for serious subwoofers that can handle the power. Please note this particular amp needs a healthy electrical system including a low gauge wire capable of delivering the necessary current. Remote Bass Knob is Included!