Kenwood Excelon P-XW1221SHP 12" ported subwoofer enclosure at Crutchfield
RCF SUB 702-AS MKII Active 12" Compact DJ / Club Subwoofer 1400W + Cover | Reverb
Pyle Padh212 1600w Outdoor 7 Way Pa Loud-speaker Cabinet Sound System With Dual 12" Woofers, 3.4" Piezo Tweeters, And 5"x12" Super Horn Midrange : Target
Amazon.com: Bbox Dual Vented 12 Inch Subwoofer Enclosure - Pro Audio Tuned Dual Car Subwoofer Boxes & Enclosures - Premium Subwoofer Box Improves Audio Quality, Sound & Bass - Spring Loaded Speaker Terminals : Electronics
Amazon.com: American Sound Connection Single 12" Subwoofer Regular Standard Cab Truck Sub Box Enclosure 5/8" MDF : Electronics