Velodyne DEQ-8R 8-Inch Powered Subwoofer (Black) (Discontinued by Manufacturer) 8-inch powered subwoofer with 1-touch auto-EQ room bass correction with microphone 8-inch forward firing long-throw woofer with 2-layer copper voice coil Remote control and front panel display keep you informed of any change you make to the bass 4 one-touch listening presets customize the bass sound for best performance with music or movies Efficient front-firing slotted bass reflex cabinets for high output with low distortion