Klipsch R-5800-WII In-Wall System #52 You will Receive: 2 R5800WII....1 R5502WII....2 CDT5800CII....1 SW-115 SUBWOOFER The Klipsch SW-115 subwoofer delivers bass response below 20 Hz. Whether it's the synthesized bass of an explosion or earthquake from a film or the extremely low true bass of a pipe organ or the distinct multiple low notes coming from a bass guitar, you will sit up and take notice of any and all extremely low frequencies. The SW-115's presence will be felt even in oversized rooms but its aesthetics allow it to blend within any setup or room size. Its front-firing 15-inch driver and slot port not only reinforces the large driver for extremely high output, its design also helps to solidify the cabinet for minimal resonance. That means the Klipsch SW-115 subwoofer can be built into a wall or cabinet or hang out in a corner and still deliver maximum output and minimum "boominess."