What are the differences in Tweeter materials?

How about Accuton ceramic tweets?

Just a general observation: I've heard plenty of metal-dome tweeters that sound the way soft domes are reputed to sound, and I've heard plenty of soft-domed tweeters that sound the way metal domes are reputed to sound. I don't think you can make generalizations about the sound character of one or the other.
-Bob

To my point of view à tweeter that does not have à contribution to the mid-driver can not realy help the speaker to breath.the only one the answered the need in the case of my speakers talon khorus II was AUDAS titanium

"Just a general observation: I've heard plenty of metal-dome tweeters that sound the way soft domes are reputed to sound, and I've heard plenty of soft-domed tweeters that sound the way metal domes are reputed to sound. I don't think you can make generalizations about the sound character of one or the other.
-Bob"

Very interesting post. I understand what you are saying but can you give some examples? For me, getting the high frequencies right, is one of my most important goals when setting up a system. Overall, I tend to prefer non metal tweeters. If you've found some exceptions to how metal tweeters typically sound, I'd really like to check them out myself. So far, I've never heard a metal tweeter that goes that far as to sound like a soft dome.

.. Then there is heil type folded diaphragm type still used in some speakers like goldenear. I've always thought these to have some unique advantages though I have also observed these as somewhat delicate and not hard to fry in years past. I heard a pair of goldenear aon speakers just today. Very smooth and easy on the ear with good detail. Had not heard a heil type tweet in years.