The Skar Audio SDR-10 D4 subwoofer was designed to produce consistent, powerful, low-frequency sound. This woofer’s high flux ferrite motor allows it to handle a lot of power for lengthy periods of time. The Skar Audio distinctive red spider is connected to a 2.5″ high temperature, 4-layer copper voice coil in the SDR series. With a peak power rating of 1,200 watts and an RMS power rating of 600 watts, the SDR-10 D4 is rather impressive.