LAB PreFab™ 1.00 ft^3 Sealed MDF Enclosure Box for Single 12" Round Car Subwoofer
TRU SPEC Prefab Single 12" Subwoofer Enclosure Sundown SA 12v2
First Subwoofer box I ever built. $0 budget just using scraps around the shop. Boss told me not to build a box it's cheaper to buy a prefab, and I took that
Down4sound PRO-FAB 12 | 12 Sub Box | Single 12-Inch Ported Subwoofer Enclosure Box - Down4Sound Shop
TRU SPEC Prefab Dual 6.5" Ported Subwoofer Enclosure Box Sundown SA / DC M3 | eBay