Mackie Thump18S 1200W 18? Powered SubwooferThe Thump18S powered subwoofer features a professional band pass design that delivers class leading output and deep, punchy lows. Designed by a world leader in portable live sound, the Thump18S provides 1,200W of continuous Class D amplification for high output applications, bringing your Mackie Thump or SRM system to an entirely new level. A full set of professional input and output connections provides simple integration and sonic optimization of