Polk Audio CSI A4 Center Channel Speaker (Single， Black)<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>A single center channel speaker timbre-matched to fit any Polk Audio home theater or multi-channel music system</li><li>Two 5.25-inch dynamic balanced drives with polymer composite cones</li><li>One 1-inch silk composite dome tweeter</li><li>Features a neodynium magnet， low viscosity ferro-fluid cooling， and a heat sink on the back of the magnet</li><li>All MDF construction and extensive asymmetric cabinet bracing ensure resonance-free enclosures</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31iG%2B9k-V8L.jpg" noproxy>