Polk Audio FXI A4 Surround Speakers (Pair， Black)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> 5.25" Polymer Composite Dynamic Balance Woofer </span></li><li><span class="a-list-item"> Dual 1" Silk Polymer Composite Dome Tweeters With Neodymium Magnet </span></li><li><span class="a-list-item"> Imp: 8ohm </span></li><li><span class="a-list-item"> Pair of timbre-matched surround speakers to fit any Polk Audio home theater or multi-channel music system </span></li><li><span class="a-list-item"> Equipped with a 5.25-inch dynamic balance driver with polymer/mineral composite cone </span></li><li><span class="a-list-item"> Features a neodynium magnet， low viscosity ferro-fluid cooling， and a heat sink on the back of the magnet </span></li><li><span class="a-list-item"> Equipped with two 1-inch silk/polymer composite dome tweeters </span></li><li><span class="a-list-item"> All MDF construction and extensive asymmetric cabinet bracing ensure resonance-free enclosures </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/31v%2Bww%2BODPL.jpg" noproxy>