Definitive Technology ProCenter 100 MK-II Center Channel Speaker Compact, inert speaker cabinets molded of high-density, mineral-filled, non-resonant polymer PolyStone Magnetically Shielded for safe placement on or near video monitors or TVs Two 4-1/2" long-throw upper bass/midrange drivers with durable butyl rubber surrounds for clear and natural midrange and voice reproduction 1" ferrofluid-dampened Pure Aluminum Dome Tweeter for clear, natural highs and pinpoint imaging High efficiency horizontal D'Appolito Driver Array delivers the full dynamic range necessary for proper lifelike reproduction of center channel information