Amazon.com: QPower QBOMB12V Dual 12 Inch Subwoofer Box with Bedliner Spray for Speakers, High-Performance Vented Subwoofer, Durable Sub Box, Black : Electronics
Gately Audio Subwoofer Enclosure 4 X 12" Ported Sub Box 7.0 CF Subs Up Port Back | eBay
Down4sound PRO-FAB HD3 | Dual HD 12-Inch KERF Port Subwoofer Enclosure — Showtime Electronics