Mackie Thump115S 1400W 15" Powered Subwoofer Kit with Cover,
Mackie SWA1801 18-inch Active Subwoofer • Available from ChurchGear
Mackie Thump 18S 18" 1200W Powered DJ PA Subwoofer with Professional band-pass design Dual XLR inputs Stereo high-pass and Stereo full-range outputs - Walmart.com
Mackie SWA1801z - 800W 18" Active Front-Firing Subwoofer