best wood for speaker cabinets ? oak,cherry, balti

Solid hardwoods will give you problems with dimensional stability, with wood expanding up to 1/8" per foot across the grain and negligibly with it. Raised panels on furniture are made with undersized floating panels for this reason.

People who successfully use solid hardwood for speakers tend to limit themselves to small speakers, floating baffles, and open baffles where pieces don't have joints with grains at 90 degrees to each other (if it all expands in the same direction it doesn't matter).

Im not a carpenter i give up!!

A fairly new and non-traditional alternative is bamboo plywood. Not expensive, fairly dense, and a bit "greener".

http://www.calibamboo.com/bambooplywood.html

What did Kondo recommend for speaker material?

Mattzack2, I just took a look at the #3 kit. The birch ply is a no brainer, imo. They look fun enough to build, maybe you can play with a couple of proto builds and see which you like in your system. Careful. It can be addicting. :-)

Thank you, Isochronism. My amateur status shows itself in the finishes. ;-)