best wood for speaker cabinets ? oak,cherry, balti

Having been a cabinet maker for 15 years before I changed careers I would say that If you're serious about building speakers and are relatively efficient why not try building a pair of them from one of the solid woods you mention AND a pair from baltic birch and see which you like better? Or build
the Baltic-birch first and if you feel they can be improved upon, then build one from a solid wood you find appealing.
There's a very informative book by R.Bruce Hoadley titled "Understanding Wood" that gets into scientific/mathematical
formulae for calculating engineering data for various wood species, including specific gravity,stress loading under tension/compression etc.
Another factor to consider is that the regional characteristics for hardwoods do vary somewhat; Claro walnut is quite different in density than the black walnut that I used to buy in Mi. Red Oak differs somewhat from white oak, and southern cherry (from say, Tenn.) will likely differ in weight per board ft. compared to cherry from New York or Penn. I'm thinking you probably want the stiffest varieties of these species to minimize cabinet resonance- but I don't really know.
Let us know how it works out!

Al's example, whom does give serious thought/research in choices, makes me ponder further. His example in Daedalus chooses a different material as baffle for a reason, I'd assume. Violins and high end Archtop guitars also use spruce tops as a soundboard, with differing material, in this case maple backs and sides. Musical Affairs Grand Crescendo's are designed loosely as a resonating violin or guitar body. The plot thickens....

BTW, I was opportuned to listen/enjoy MAGC's and was quite smitten!

When I first got into the high-end business, many years ago and started to meet the designers, I was told by many that you should never build a speaker completely out of solid wood. That was over thirty years ago, but I think the principals/rules are still the same.

Birch, oak and walnut are acoustically "stupid" woods and you want to have nothing to do with them. If you must use something other than MDF use cherry. And, yes, cherry can be very different. I think, Michael Green used cherry in his reference free resonance Chameleon speakers. If I remember right he imported it from a particular mill in Canada. And the way the cabinets of his speakers were constructed required serious skill and great hearing. Are you up to this?
Acoustic guitars's top is made of spruce, right, but "the body" can be made of different woods. Of what I heard a guitar made of some sort of rosewood sounded best.