The Klipsch KPT-684-SW is a high-quality THX® approved cinema subwoofer that features an advanced low-frequency driver design inside a bass-reflex enclosure for smooth response to the lowest audible frequencies. The system utilizes dual 18-inch drivers that gain the system’s amazing 105dB sensitivity through the use of large, geometrically optimized magnet structures and lightweight cones. Built from the inside out for performance and durability, the KPT-684-SW packs a punch that lets audiences hear as well as feel the impact of edge-of-your-seat entertainment.