Are you suggesting that properly fan braced mohagony cabinet with a rosewood back and spruce top would be bad sounding? :)

Be fun to make up some smallish units for fun and measure them.

I dont work with MDF anymore. I never liked it and used it beacuse it was good for veneering. well, it just plain suck most other times!
I do all veneer work over birch ply now.

Ther's more to be said for a 'tuned' cabinet than one made from 4 inches of concrete?

Bill