Down4sound PRO-FAB HD3 | Single HD 12-Inch KERF Port Subwoofer Enclosu — Showtime Electronics
DS18 ENS-212SPB Ported Subwoofer Enclosure 2 X 12”
Bazooka BTA850FH 50-watt powered 8" Bass Tubes enclosure® with included factory radio connection kit at Crutchfield
Car Audio 6.5 Inch 8 Inch 10 Inch 12 Inch Bass Tube Active Subwoofer Round Subwoofer Box Enclosure - China Car Speaker, 6.5 Inch Bass Tube | Made-in-China.com
Amazon.com: Bbox Dual Sealed 12 Inch Subwoofer Enclosure - Pro Series Dual Sealed Car Subwoofer Boxes & Enclosures - Premium Subwoofer Box Improves Audio Quality, Sound & Bass - Spring Terminals : Electronics