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Join Date: Nov 2006
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btp is correct on the rounding of driver cutouts,the only rounding(cosmeric reasons)that can be made is on the "outside" where the woofer fires.
But looking at your manifold(drawing) it will still be very inert and strong.Three layers and the middle bracing will make for one strong box structure.
Ask yourself mortal , do you have as much displacement as me ? The answer is no unless you have a Windmere fan sub.