Could glass displace (your fave) tweeter material?

@erik_squires , I agree that this could end up being something big if glass diaphrgms make their way into midrange drivers.  Personally I'm hoping to see glass diaphragms in prosound compression drivers, which are sort of like midrange-sized domes with really strong motors.  If glass really is (or becomes) a viable alternative to Beryllium, imo that would be huge.

Mass, stiffness, self-damping. Tweeter designers struggle to find a balance between those qualities. I'm not sure glass has much to recommend itself over diamond, beryllium or doped fabric. But then, it depends on the composition of the glass since all glass in not created equal.

@erik_squires 

Come on Eric you are very knowledgeable about all things audio so I’m sure you know beryllium is only toxic when being machined , sanded or otherwise being physically worked with creating dust or fumes. 

I'd love to see someone come up with a dome midrange that could play well throughout the whole vocal range.  

At Axpona this year, I listened to some stand mount two-way monitors with both glass diaphragm tweeter and woofer.  I have no idea if the measurements are good but they sounded really nice.