Polk Audio RTi8 High Output Floorstanding Loudspeaker (Single, Black) A single real wood floorstanding speaker with all MDF construction and resonance-free enclosures Equipped with dual 6.5-inch polymer composite cone drivers with rubber surrounds Features a neodynium magnet and a heat sink on the back of the magnet Equipped with one 1-inch silk/polymer composite dome tweeter PowerPort Plus bass venting ensures superior clean, low distortion bass