DISC Mackie SWA1801 18- inch Active Sub | Gear4music
Mackie SR18S 18" 1,600W Professional Powered Subwoofer Black | Guitar Center
Mackie DRM18S 2000W 18 inch Powered Subwoofer | Sweetwater
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
Mackie SRM1801 18 in Powered PA Subwoofer 1000W | PSSL ProSound and Stage Lighting