Definitive Technology ProCenter 1000 Compact Center Speaker (White) & Definitive Technology Pro-Mount 90 - Pair (White) Definitive Technology ProCenter 1000 Compact Center Speaker: Equipped with two 4.5-inch cast basket drivers coupled to Definitive Technology ProCenter 1000 Compact Center Speaker: Single ProCenter center-channel speaker Definitive Technology Pro-Mount 90 - Pair: Articulating wall mount bracket accessory for Definitive Technology speaker