Whether its an explosion or earthquake on a Hollywood soundtrack, crisply plucked notes from a bass guitar, or the subterranean tones of a large cathedral pipe organ, the Klipsch R-115SW lets you hear and feel those extremely low frequencies that add realism and energy to your movies and music. This subwoofers high-output 400-watt amplifier pushes a 15" woofer made of a strong-yet-lightweight ceramic-coated aluminum for quick, precise movement, minimal distortion, and deep, bone-crushing bass even at concert-hall volume levels. The front slot port helps minimize turbulence for cleaner sound. And since the port is in the front, you wont hear unwanted "boominess" from sound reverberating off your walls and floor. Line-level and LFE (Low-Frequency Effects) inputs let you easily connect the R-115SW to almost any home theater or stereo receiver. Its back-panel volume, crossover, and phase controls help you fine-tune the bass to your liking, and blend its sound into your system. The sub comes housed in a durable MDF cabinet and finished with a brushed black polymer veneer. A front-mounted LED power indicator makes it easy to tell when the subs powered up and ready to rock.