The low-profile Klipsch KPT-418-SW high-output cinema subwoofer system uses a single 18-inch driver mountd in a bass reflex enclosure to accurately deliver the earth-shaking effects of today’s most demanding movie soundtracks. With a depth of only 11 inches, the KPT-418 is even more compact than other cinema subwoofers, with greater output and great placement flexibility. It can be used as the main subwoofer system in a small auditorium, or as the subwoofer for surrounds in small- to medium-sized auditoriums.