Best wood under audio components?


I am just about finishing my DIY audio rack and wondering about what type of wood would be the best directly under the components? 
I am from Norway and don`t have access to North American maple. Baltic birch plywood is rare also, because we have Norwegian. I would rather have other solid type of wood under my components than plywood, but the efficiency is the major consern, not the outlook.

What type of wood would you recommend?

Thank you! :)
128x128korakotta
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.
Post removed 
Oops. The man is in Norway. I confused this thread with another one regarding same question.
What do you have in Norway ?