dazzdax
beryllium vs diamond
I don’t want to burst everyone’s Beryllium/Diamond bubble
These are just "dust coatings" adhered over the top of main diaphragm (usually polyprop) to aid in stiffening, trouble is they add mass to it also. I found this out when I saw a scratch on the Beryllium and saw milky clear plastic underneath on a pair of Yamaha 1000X
The only one I know of that used pure Beryillium forged/spun cones was one Yamaha speaker, the impossible to find http://www.thevintageknob.org/yamaha-GF-1.html
All the other Yamaha’s were Beryllium deposited on polypropylene diaphragms.
Cheers George