Polk Audio DSW PRO 500 10-Inch Powered Subwoofer (Single, Black) Downward radiating slot port to lessen turbulence, noise and distortion Frequency response: 23Hz - 160Hz Equipped with Polk Room Optimizer (PRO) and Feed Forward distortion suppression technology A single 10-inch powered subwoofer unit Power amplifier: 200 watts continuous, 400 watts dynamic A single 10-inch powered subwoofer unit Equipped with Polk Room Optimizer (PRO) and Feed Forward distortion suppression technology Power amplifier: 200 watts continuous, 400 watts dynamic Frequency response: 23Hz - 160Hz Downward radiating slot port to lessen turbulence, noise and distortion