Ported Sub Box Enclosure for 2 12" Subwoofers ~Plexiglass~ 6" AEROPORT ~ 4.7CF | eBay
Amazon.com: QPower QBOMB12V Dual 12 Inch Subwoofer Box with Bedliner Spray for Speakers, High-Performance Vented Subwoofer, Durable Sub Box, Black : Electronics
Amazon.com: Custom Ported/Vented Sub Box Subwoofer Enclosure for 2 12" Subs - 32 Hz - 4" Aeroports - 4.3 CU FT : Electronics
Custom Ported Subwoofer Box Sub Enclosure for 2 12" Kicker CompVX CVX - 34 Hz | eBay
2 Skar Audio VFX 12" Sub and Port Back Subwoofer Box Plans | CustomLowz