A single center channel speaker timbre-matched to fit any Polk Audio home theater or multi-channel music system * Two 5.25-inch dynamic balanced drives with polymer composite cones * One 1-inch silk composite dome tweeter * Features a neodynium magnet, low viscosity ferro-fluid cooling, and a heat sink on the back of the magnet * All MDF construction and extensive asymmetric cabinet bracing ensure resonance-free enclosures