Check out this video tutorial on how to carpet a fiberglass car subwoofer box for speakers. It's easy enough to carpet a fiberglass subwoofer box, but if you're having trouble just watch this car audio upholstery video. The carpet used is unbacked automotive carpet. If its unbacked, its pliable to bend to curves. A box made with MDF is different. Edges means you have to have seams showing.
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