Mackie Thump 18S 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 - Walmart.com
Strait Music - Mackie DRM-18S 2000 Watt 18" Professional Powered Subwoofer