Subwoofer Enclosure Design: Bending the Rules to Maximize Output - DD Audio
Dual 12 Inch Car Audio Vented Sub Box Ported Stereo Subwoofer Speaker Enclosure - Walmart.com
Dodge Charger Subwoofer Box 2011 and up (Super Custom!) - AudioDesigns CG Store
Amazon.com: QPower QBOMB12V Dual 12 Inch Subwoofer Box with Bedliner Spray for Speakers, High-Performance Vented Subwoofer, Durable Sub Box, Black : Electronics