Which Tweeter preferred- dome natural material, Beryllium/Metal or Planar Ribbon? Why?

After 40+ years I am totally satisfied the the incredible sealed-ribbon tweeter that Raidho uses (and Borresen Acoustics) in its D series (old used D2s for me). (Mid/woofers ported, but a small floor-stander 'box' design.)

I liked my oldest, 16-yr mains, ML SL3 electrostatics, but the treble performance of the Dynaudio silk Esotar II was much better for the five years I owned the Sapphires, nice speakers but not the D2s I was fortunate to acquire. I do feel silk is very good for a dome, metal not so much, and diamond tweeters-ugh, never took to the B&W 800s a bit, too harsh for my ears.

The Heil AMT type sure offers some good examples and probably some so-so, like all styles as others have noted. Implementation of the design counts.

The best I've ever heard were plasma at the CES show 40 years ago.  They were that memorable.  

The AMT tweeter with a SET amp are pretty magical

Great tech and review source is Hifi Compass.

My personal favorite is the Viawave Srt-7. 

Tom

The best I’ve ever heard were plasma at the CES show 40 years ago. They were that memorable.

I’m afraid I’ve heard them, in a cramped hotel room of course, and wasn’t that impressed. It would be nice to hear them again in a more ideal setup.

@jperry

It really depends upon the execution of the design and integration in the speaker as a whole.

I'd say so too.

The best tweeter is one that does not draw attention to itself.

I’ve heard some cheap tweeters that didn’t and some expensive ones that did.

The worst case was the Seas Excel which introduced a very odd colouration to John Lennon’s voice on Across the Universe.

Before anyone gets upset, I acknowledge that it’s an great tweeter, almost everyone says so, but in this design, despite the high level of resolution it offered, it was drawing attention to itself.