The Mackie Thump18S is a high-performance powered subwoofer designed to deliver deep, rich, and "chest-thumping" bass to complement Thump series full-range loudspeakers and other PA systems. It features a professional band-pass design that maximizes output and ensures a powerful low-end, even under strenuous live sound conditions. Its custom 18" high-output woofer is driven by a cool-running 1200W peak (600W RMS) Class-D amplifier, offering ample power while minimizing the risk of thermal shutdown.