Speaker building, bottom?

Given the strength of glue joints, it likely make little difference.

I was induced, by Chris who built out cabinets to (usually) place the top and bottom inside the fronts and backs.

Some examples: the first one is a trapezoid, top & bottom on the outside, the middle one, my originally done top and bottom on the outsid, and the third a Chris approved orientauion.

]http://www.planet10-hifi.com/planset/A5x-extents-291117.pdf

dave
 
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Having been involved with all manner of materials, structure design from little cardboard packaging to huge steel/boilerplate seismic, hurricane, etc., rated electrical controls substations and their various deform/burst limits (keeping the doors on is the really tough requirement!), the 1st one by a huge margin, though as long as there's some internal bracing to tie all sides together as p10 normally does makes it or at least around the joint perimeter, it's academic.
 
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In speaker enclosures typically the stiffness/rigidity requirements ensure the strength requirements are not going to be an issue as the materials are far thicker than strength requires. Even with just glued joints this is usually enough, but add some screws and you have something that is as rugged as most furniture.