Polk Audio PSW111 Subwoofer (Single, Black) Single 8-inch subwoofer with compression circuitry to limit distortion,it is not wireless Best matched for RM and SurroundBar series or compact speakers from other manufacturers Non-resonant all-MDF enclosure construction and internal bracing Rated to 150 watts of continuous power (300W peak).Measures 12-1/8 x 11 x 13 inches (HxWxD) Special Shipping Information: This item cannot be returned to Amazon.com. For additional information concerning this policy, please visit our Product Specific Returns Policy Page