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QPower® QBOMB12 4HOLE T - QBomb Series 12" 4-Hole Forward/Upward-Firing Sealed Subwoofer Box
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Gately Audio Subwoofer Enclosure 4 X 12" Ported Sub Box 7.0 CF Subs Up Port Back | eBay
Triple 12" Loaded Kicker C12 Subwoofer Box (10C12-4) | Kicker-Package-653
Custom Ported Sub Box Enclosure for 4 10" Subs ~ BIRCH PLYWOOD ~ 5.3CF - 34 Hz | eBay
Gately Audio - 4 12” subs up port back 8.0cf
