Advantages of beryllium?

@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. 

Micro-motor tweeters are just tweeters with the bare minimum motors to work. Focal as well as B&W are proponents of this approach. The motor is no wider than the dome and usually less than half an inch thick.

Despite assertions otherwise, popular micro-motors measure terribly across distortion, frequency and lack of linearity, regardless of material used.

They are routinely outclassed by relatively inexpensive models from popular driver vendors.

Best,

E

@erik_squires 
I'm gonna ask you to prove that jazz.