Advantages of beryllium?

@erik_squires 

Does the 936 have a Beryllium driver? Or is that reserved for higher up Focals?

Per the web site, it is Al/Mg.

Nothing against Al/Mg but Focal has this fetish for micro motors which are never as smooth or dynamic as the large motor variants.

Though lately ScanSpeak has produced some tweets which are close to the same motor size and very very good sounding.

@erik_squires 

What do you mean by micro motors? I don't understand that term, sorry.

I worry that people will accidentally stick their fingers into the tweeters of those precious Magicos…and according to at least one guy who sells them it seems that's not such rare a thing. My fragile aluminum-magnesium tweeters are covered by a mesh screen so have another drink cousin Shirley! Just don't knock the damn speakers over.

@erik_squires 
It's not so much as just a lack of necessity. The voice coils in the inverted domes are way smaller than anything you'll ever see in a convex dome even 3/4ths the size. You just don't need a magnet as large to concentrate the same energy in the smaller coil. 
And yes, the 936 uses an Al-Mg tweeter. I think I mentioned that. My point was to dispell the myths and dogma some like to generically attribute to metal drivers.