Polk Audio PSW111 Subwoofer (Single， Black)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Single 8-inch subwoofer with compression circuitry to limit distortion，it is not wireless </span></li><li><span class="a-list-item"> Best matched for RM and SurroundBar series or compact speakers from other manufacturers </span></li><li><span class="a-list-item"> Non-resonant all-MDF enclosure construction and internal bracing </span></li><li><span class="a-list-item"> Rated to 150 watts of continuous power (300W peak).Measures 12-1/8 x 11 x 13 inches (HxWxD) </span></li><li><span class="a-list-item"> 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 </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/414Fu31JwLL.jpg" noproxy>