Polk Audio PSW1000 Powered Subwoofer (Single, Cherry) High performance dual 10-inch subwoofer speaker Two Bass Venting Technologies  Slot Load Vent and PowerPort -- combine to virtually eliminate port turbulence and noise Frequency response: 20Hz - 160Hz Convenient Front Panel Control Pod gives instant access to volume control, low pass adjustment, 3dB bass boost toggle switch and power indicator light Heavy duty MDFCabinet with 1.75-inch side panels and rigid internal bracing