Sundogue, I use 3/4" plywood so I don't need all that extra bracing. Dadoes and rabbets are fine and require little extra set-up. Carpentry is carpentry, whether you are building a bass cabinet or cedar chest. 1/2" plywood is less sturdy than 3/4". And I want the speaker to do the rockin' not the cabinet.
As I said, use the proper tool for the job.
1/2", properly braced, has proven to be solid for bass cabs. The bracing adds far less weight than the 3/4" does for a more solid cabinet. I have yet to have a 1/2" ply cabinet do any rocking, vibrating or moving.
Don't believe me? Let's build a bridge across the street out of plywood. You span the whole thing with a layer of 3/4" plywood and I'll span it with 1/2" ply with bracing. Mine will be lighter, yet stronger. I once built a bridge in an engineering class out of nothing but 1/4" balsa sticks that held five 200 lb. people walking on it (and I still lost the competition to someone who built one that held 8 people!). My brother is working on using 1/8" thick panels with a honeycomb design for even lighter panels and one TB'er here even made a fiberglass cab.
Yes, carpentry is carpentry, but carpentry is not engineering. And there is nothing wrong with using 3/4" ply at all...except weight. It's strong and sturdy, no doubt. It's just heavy. At least it isn't MDF.
HOLY CRAP!!!!!