Amazon.com: QPower 8 Inch Quad Port Car Subwoofer Speaker Enclosure Box with Bed Liner and Underseat Down Front Fire for 4 Subwoofers, Black : Electronics
Qpower Qbomb8v Dual 8 Inch Vented Port Subwoofer Sub Box With Bedliner Spray : Target
Down 4 Sound - Quad 6.5" or 8" Custom Sub Boxes with Kerf