Amazon.com: Mackie Thump18S THUMP-18S 600W 18 inch Powered Subwoofer Powered PA Subwoofer with Dual XLR Inputs with Five EMB XLR Cable and Gravity Magnet Mobile Phone Holder Bundle : Musical Instruments
Mackie SRS1500 15-inch Active Subwoofer ( no shipping ) | eBay
Mackie SWA1801z - 800W 18" Active Front-Firing Subwoofer