The TS218S is a 18-inch 1250W Powered Subwoofer for those performance situations where additional low-frequency output and punch are required, even beyond the already-impressive bass capability of the TS2 full-range speakers, the new TS2 powered subwoofers are the perfect solution Pair TS218S with any full-range speaker system to extend the bass response and dramatically enhance the overall impact of the music being played.