The Reference R-115SW subwoofer is the perfect combination of power, sophisticated and heart-pounding bass. Packing a serious punch, the R-115SW will not only wake your neighbors, it'll piss them off. The way only Klipsch can. The 15"" spun-copper Cerametallic™ woofer All-digital amplifier delivers 800 watts of dynamic power Front-firing slot port with exclusive internal flare technology L/R line-level/LFE RCA inputs for compatibility with most receivers. Proprietary internal geometry that minimizes port noise for clean undistorted low frequencies. The front-firing design allows for placement flexibility.