Phantom - driver sizes, crossover point...

[EvPa]

I do not think that Devialet has given details about driver size (well, I could use a ruler but it would not be very precise) and crossover frequencies but according to this photo taken yesterday at Munich's HIGH END 2015:

it appears that the side-firing woofers cover the 16-300Hz range.

I do not know if Devialet ever said what the tweeters were made of either...