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RE: Looks Like Another Copy Of Your Design

Technically, you can make the mouth open on all sides. But why would you want to do that? Why would you want to dissipate the sound wave to the back?
The back is indeed straight and flat. It is 1.5" (two layers of 3/4" Baltic birch) The sides are slightly curved and serve as a guide/jig for laminating the sides. I then measured the cross sections of the horn as it propagates downwards and drew a line connecting the dots. I then used a jigsaw to cut the sides along that line. Both sides then served as a guide/jig for the front. Sides and the front are more than 1" thick. With back being 1.5" and three sides being laminated from many layers of plywood, the whole structure is extremely rigid.

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