What are the differences in Tweeter materials?

Steve Mowry says in the article "The Whole Truth About Beryllium Diaphragms: -

"For a given geometry the first bending (break-up) frequency is proportional to the material Speed Of Sound, where the speed of sound within a material is defined as the square root of the Young’s Modulus divided by the Mass Density, (m/s); the higher the better. However, the Mass of the diaphragm must also be considered. Then the ratio of the Speed Of Sound to the Mass Density can be used as the materials’ acoustic figure of merit, (m4/kg/s); the higher the better."

After that he shows values of "Acoustic Figure of Merit" for different material (higher the better)in m4/kg/s

Berillum - 6.97
Diamond - 4.92
Aluminum - 1.86
Titanium - 1.13
Steel - 0.63

Mezzanine,

How come you didn't include camel hair tweeters in you list of soft dome materials?

Kijanki,

I think you just P**** Off quite a few speaker companies. Looks like you just cracked the secret industry list price multiplier formula.

Zd542,

Something I said in my post that offended you? Do you really have to respond in such a rude manner to a normal question I asked?

Kijanki, ,

That was very interesting. Thanks for the post. I would have thought the value for titanium would have been higher than aluminum.

Do you have any info on soft domes? I am wondering what the difference in materials between soft domes and a textile dome? Or perhaps a textile is considered a soft dome as well?

"Something I said in my post that offended you? Do you really have to respond in such a rude manner to a normal question I asked? "

I have no idea why you would say that. What part of my post offended you?