This Pioneer Sealed 12 in. 1 .300-Watt Max Active Subwoofer with Built in Amp features an innovative trapezoid shape for high rigidity and reduction of internal standing waves while increasing installation flexibility. This 350-watt nominal amplified subwoofer can be installed freely in the cabin or under seats . and it can be repositioned with the subwoofer firing rear . front or upwards for optimal bass tuning! The built-in high-bandwidth . high-output and low-distortion Class D amp is ideal for small . sealed enclosures and is matched to a high-sensitivity 12 in. woofer. User-adjustable controls include an LPF . phase control and variable bass boost for enhanced control. To expand system flexibility and user control . the input gain can be adjusted using the included wired remote bass control knob or via the input gain control mounted on the enclosure side panel. The enclosure is fully carpeted . creating a nonslip . durable and scratch-resistant surface. Enjoy bass the way it was meant to be heard with this Pioneer powered amplified subwoofer!