Mackie Thump18S 600W 18-inch Powered Subwoofer 600W 18" Powered PA Subwoofer with Dual XLR Inputs, Stereo Full-range and Highpass Outputs, Adjustable Level and Polarity Controls, Built-in Handles, and Pole Cup. With a cutting-edge bandpass design that delivers class-leading output and deep, venue-shaking bass, the Mackie Thump18S serves up your lows with impressive clarity and punch. The Thump18S sports an 18" custom high-output woofer powered by a beefy, cool-running 600-watt RMS Class D amplifier, all housed in a rugged wood enclosure. The system gives you powerful low-end response from 40Hz-120Hz (-3dB). And with dual XLR inputs, stereo full-range and highpass outputs, adjustable level and polarity controls, and a pole cup for mounting your main speakers, the Mackie Thump18S gives you the flexibility you need for just about any sound-reinforcement scenario. Mackie