07-17-09: 6550c
"baltic birch ply is 1 of the best materials"
I though all plywoods have the potential to delaminate and vibrate internally and thus should be avoided ?
There are lots of ways to laminate. I used to work in sales at a piano rebuilding store. I recognize the stock used in the cabinets of Magico, NuForce, and Lominchay--commonly called Baltic birch--as the same material the piano shop used for pinblocks. I've held the raw stock in my hands. This was a premium rebuilding shop and this stock was the best available for pinblocks, which have to be able to hold over 200 threaded steel pegs in a grand piano to anchor all the strings and enable them to be tuned. This stuff does not come apart!
In fact, this stock is very heavy, and certainly inert, because more of the weight is from the resin that holds it together than from the wood itself. It would be an excellent speaker cab material--very rigid, strong, cohesive, and inert.