Originally Posted by PT Teal
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Plexi is actually slightly stronger than MDF. Its not quite as rigid, but if you can get your hands on a piece of 1/2" plexi, try to bend it....it's about as easy as bending a similar piece of 1/2" MDF. I'd suggest 1/2" plexi for any common speaker box application.
Plexi is WAY expensive. I priced a sheet of 4*8 1/2" at a local autoglass dealership, and it was well over $500. Unless you're absolutely sure of what you're doing, I wouldn't recommend buying a sheet of plexi and trying to cut it into a box....that would be an easy way to waste $500.
If you can have the pieces cut for you by somebody who really knows what they're doing and have the money to burn, I say go for it. Just remember: you can't screw this stuff together the same as MDF. You'll have to buy a special type of sealent and drill pilot holes for the screws about every 3".
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