Polk Audio RTI A7 Floorstanding Speaker (Single, Cherry) Dual 7" Polymer Composite Cone Drivers With Rubber Surround 6.5" Polymer Midrange Driver 1" Silk/polymer Dome Tweeter Single real wood floorstanding speaker with all MDF construction and resonance-free enclosures Equipped with a single 6.5-inch polymer composite cone driver and dual 7-inch polymer composite subwoofers Features Power Port technology to reduce "chuffing" or "port noise" Equipped with one 1-inch silk/polymer composite dome tweeter Features a neodynium magnet, low viscosity ferro-fluid cooling, and a heat sink on the back of the magnet