Polk Audio RTi10 High Output Floorstanding Loudspeaker (Single, Black) Single real wood floorstanding speaker with all MDF construction and resonance-free enclosures Equipped with dual 6.5-inch polymer composite cone drivers and dual 7-inch polymer composite subwoofers with rubber surrounds 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