Polk Audio PSW110 10-Inch Powered Subwoofer (Single, Black) for $173.89

This new Powered Subwoofer delivers powerful, accurate and musical bass at shockingly low prices. Built for power and value, the new models represent a continuing refinement of the highly regarded PSW Series and a great introduction to visceral home theater bass performance. Loud & Low Specs(CEA2010): Low 114.6 db / Ultra 86.7 db