beryllium vs diamond

The esteemed moderators have wisely deleted the insulting, mocking, and arrogant post directed at me above by kosst

That’s typical as when he’s on it he has no idea, is obnoxious, and full of it in more ways than one. The only cure is to put an AVO out on him

I love Maggies but they can not hold a candle to a big ESL.

Totally agree, and neither can any dynamic tweeter I’ve heard, the top Raven ribbon comes close, and the way out in front of all is a Plasma, preferably without horn loading.

Cheers George

smodtactical, 3.7s are the cherry in the line cost considered and you will usually be able to hear them at a dealer. 
Carbon, beryllium, diamond, silk, paper mache, whoopee. Power handling is the big issue for domes. But you are still left with a point source radiator.  Using them in multiples has never worked well and probably never will. So, if all you are looking for is a midget sound stage they can be wonderful and I am not so sure the material makes an overwhelming difference. It is more important to find a speaker you like the sound of and will support the volume levels you aspire too and the best Tweeters will do this. 

I’ve heard enough ESLs and big membrane speakers to know what they sound like, and they all basically sound the same. They present a massive wall of hyper-detailed sound with no sense of space

So full of it, you have no idea, you just described horns.

Over many years of audio, ESL’s have given me the best imaging in both side to side, outside the speakers, and in depth perception. No dynamic I have heard even Wilson Alexia MkII has ever equaled them.

But they wouldn't hold up too long being fed a steady diet of, Daft Punk, Tool, and DCD

As for your band/music taste, it explains now so much why you are the way you are.