tweeters- metal or soft dome?


This is a somewhat broad question. What are the particular differences between a metal, or hard dome tweeter and a soft one? If comparing the two using the same electronics and cables what differences can be expected?
With hard domes- aluminum, gold, etc what sound diferences are there. Are there various materials used for soft domes? If so what are they and what are their peculiarities?
I looked in my Guide to Home Audio by Robert Harley but could not find this addressed.
valinar
Sean,
Thank you for weighing in on this. I had hoped you would. I am going to upgrade my speakers in the future, although not too soon. In the meantime I am trying to educate myself to the basics of the technology before I do some travelling to listen to various models, as I do not live close to high end dealers.
Valinar
Jmcgrogan2-

Yes Dan the man is a Van the man fan.

But after Enlightenment I kinda lost my feel for the newer stuff, tending to slip back into the mystic.
These days alot of makers are using ribbon tweeters these days. You should hear some speakers with ribbon tweeters also. You may find dome tweeters don't cut it for you.