Originally Posted by
Mr. Widget
First of all, not all plywood is the same. Typical American plywood uses 5-7 layers of fir. More and more I am finding imported plywoods with a much lighter and less structural core material. If you use a veneered birch plywood (face veneered in the wood of choice with an all birch interior) you will have the best results. Basically you want a very stiff outer constraining layer. For the inside, I'd stick with 3/4" MDF. You will end up with a wall thickness of 1 1/4", but I think it would be worth the weight and extra size. If they are small speakers say L100 sized or smaller, then I suppose 1/2" MDF would be fine... still with adequate bracing.
I use BB 6Pro. It does allow for bracing as well as differing amounts of fill. It is still imprecise. All of these programs give you is a very good guess. Ultimately I measure the results and tweak. Of course a few years ago, before I had my Clio rig... I took the results from BB 6Pro and was satisfied.
Widget