best possible wood

You can use a thinner wood, and then fiberglass it from the inside for strength without the weight. Definitely use bracing. You may still want to use a 3/4 piece for the actual sub mounting location.

 
You can use a thinner wood, and then fiberglass it from the inside for strength without the weight. Definitely use bracing. You may still want to use a 3/4 piece for the actual sub mounting location.
Fiberglass is best for strength in curves, not flat surfaces.

nG

 
Fiberglass is best for strength in curves, not flat surfaces.
nG
That is what the bracing is for. Besides, 1/4 inch thick fiberglass is harder and stronger than 3/4 inch wood. If you use 3/8 in wood with 3/16 thick fiberglass on top, it will be plenty strong for a normal box. I wouldn't load 6 15's in it though.

 
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