High Efficiency Loudspeakers

Bache, it all depends on how the cone was made and what species of wood was used. If the horn is made too thin the wood will resonate like a musical instrument but thicker cross sections of a medium density wood like teak would be very well dampened and tough enough to tolerate some abuse. Are they superior to aluminum or plastic horn's? I do not know. They are certainly IMHO nicer looking and wood allows a different group of people to get involved in making the actual speaker element. A good woodworker can make everything but the drivers which are readily available. I have never made a horn myself but I have a large lathe perfectly capable of doing a horn up to 48" in diameter (the swing on the outboard side is 24") You would do it with a segmented blank. 

is not necessary do it horn, all loudspeakers using this  and made by this high end  company  using wooden cone is not horn design

I heard them in the 9.87 system but can not differentiate them from the times I head that system with paper drivers. Their speakers are more specific than the just cone material, of course. I will guess that you will not get a good answer in forums but would get a straight forward answer from Voxativ or their dealers. Voxativ does provide plans for simple baffle construction that would be a big savings over their piano cabinets.