Best wood under audio components?

There are 2 levels only on my rack. The top is the TT (VPI Classic 1), the phono (Gold Note PH-10) is under. Both of them are sitting on sandbox. Each sandbox has a tile placed directly on the sand. The middle layer is a tube, and I am trying to find the top layer`s material
I managed to get a maple board (Shun Mook) under my TT, so I am looking for the wood under my phono.

+Both of my studio monitors (Dynaudio BM5 Mk3) under their factory stand (sittin on sand)
 
What would be the wood of your choice? -not maple, not baltic birch ply-

Yeah, ideally depends on components and on what you try to accomplish. But the OP is not going to listen to dozens of woods under all his components. I would just choose Michigan Maple or maybe Black Arkansas Walnut and call it a day. In any case, what's under turntable is of course most important. I prefer natural materials, generally speaking.

The thicker the better, due to higher stiffness. I would choose a hardwood ply if constrained by budget or maple, oak, bamboo, etc. if not constrained. 2 to 3 inches thick would be nice. The wood board should ideally be placed on cones.

You should have included all the info in the first post!
I use a 1 cm thick piece of solid walnut glued on top of the birch ply plinth for one of my 401 turntables. It sounds great. See systems. I use wenge for my armboards on the recommendation of the man who made my slate plinth so you might look at that.