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8" FIBERGLASS SPEAKER RING SUBWOOFER RINGS 3/4" MDF DIY FIBERGLASS BOX – AK Audio
LAB PreFab™ 4.00 ft^3 Ported MDF Enclosure Box for Single 15" Round Car Subwoofer
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1x AUDIOTEK Single 12" Vented Ported Car Subwoofer Sub Enclosure MDF BOX | eBay