X1 Skar Audio SDR-2X12D4 Dual 12″ Loaded 2,400 Watt Subwoofer Complete Bass Package. This includes x1 Skar Audio SKAR4ANL-OFC 4 Gauge Premium OFC 4 Gauge Amplifier. The amplifier has a built-in speaker and is capable of handling up to 1,200 Watts. It can also be used as a stand-alone unit. The subwoofer’s power consumption is less than half that of the competition.