The Mackie Thump18S powered subwoofer serves up room-shaking bass, perfect for smaller club PA systems and performing DJs and electronic musicians. A highly efficient Class-D amp pumps 1200-watts peak (600W RMS) into a custom, high-output 18" woofer to produce big, clear lows and take some of the load off of your main speakers. The Thump18S sports stereo XLR inputs and two sets of outputs, one at full-range and one with an integral high-pass filter to roll the bass out of your tops and let the sub take over. A handy pole-mount up top lets you quickly and easily mount one of your tops -- no need for separate stands.