Definitive Technology ProMonitor Compact Satellite Bookshelf Speaker - Pair (ProMonitor 1000 + Pro-Mount 90 (Pair), Black) Definitive Technology ProMonitor 1000: Equipped with one 5.25-inch cast basket bass/midrange drivers coupled to one 5. Definitive Technology ProMonitor 1000:Equipped with one 1-inch pure aluminum dome tweeter Definitive Technology Pro-Mount 90: Articulating wall mount bracket accessory for Definitive Technology speakers Definitive Technology Pro-Mount 90: 2 per pack