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Is there a particular reason that you want to make the enclosure of fiberglass?
Speaker enclosures are usually made of wood except you need to make a strange shaped box.
Chris
Thanks for the input, I have definitely considered sealed. It would be much easier.
28hz is a beautiful thing for a ported box.... well it's at least a lot of fun. I had a buddy running ZX2500 on a 12" BTL @ 28hz back in the day and that thing was just absolutely brutal. Not the loudest thing but boy it did move some serious air for a single 12. If you found a song that played in the low 30s, high 20s range, you would of thought the doors were going to come off.