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
@glow worm,
That is a very interesting way to go. Who woulda thunk it?
I got to try it, as well as using them to cook my steak.
B
I have heard salt blocks such as the Himalayan salt can sweat with changes in temperature and humidity. This can be very corrosive. I would use caution with salt blocks. 

There were lots of Himalayan salt lamps in exhibitors' rooms at CAF.  Was it just for atmosphere, or do they know something we don't know?

(Synergistic Research, look out!)

Some have tried the Bamboo cutting boards from IKEA, and like them. Surely their are IKEA's in Norway!