Below is a thread on "real wood" speakers. I have heard the Daedalus speakers championed by Al, and they certainly sound good. Other companies, like PBN Montana, do the front baffle of some models in a 2" hardwood slab. I agree with Has2be that cost is likely a major factor in the use of MDF, and I doubt there is an exceptionless rule here. Why not contact Audionote and ask them what the would use, were cost no object?
John
http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1275949549
John
http://forum.audiogon.com/cgi-bin/fr.pl?cspkr&1275949549