Lanzar OPTI4000D Optidrive 4000 Watt Mono Block Digital Competition Class Amplifier RMS Power Rating:4 ohms: 2000 watts x 1 chan.2 ohms: 3000 watts x 1 chan.1 ohm: 4000 watts x 1 chan. Pulse Width Modulated MOSFET power supplyWired remote bass level control includedLED power (green) and protect (red) indicators Variable Bass Boost (0 to +18 dB)Soft Start Turn-on