Polk Audio DSW PRO 600 12-Inch Powered Subwoofer (Single, Black) A single 12-inch powered subwoofer unit Equipped with Polk Room Optimizer (PRO) and Feed Forward distortion suppression technology Power amplifier: 250 watts continuous, 500 watts dynamic Frequency response: 20Hz - 160Hz Downward radiating slot port to lessen turbulence, noise and distortion