What speaker has the best high frequencies?


I have a Spatial Audio X5 with a wide band horn loaded AMT (Air Motion Transformer) which handles high frequencies (1k and up?). It is big, about 6” x 1”. I feel it is much better than the 1” tweeter found in most speakers.  I honestly don’t know how this AMT is different from, say, ribbon tweeter.  This leads me to think, who or what speaker has the best high frequencies?  I heard good things about the B&W diamond tweeter, but it is still a 1” tweeter.  What else is out there?  I think size makes a difference.  In this case, is it a larger ribbing tweeter better than most 1” tweeters?  
gte357s
Tastes vary, but I would say it would have to be the one playing Jennifer Warnes.
I has to do with what you like. I’ve used AMT. Some are very well behaved, some can drive you nuts. The reason for the lower XO point, some can go pretty low, for tweet duty. The problem is the higher range they can be tough to manage..

I Normally used them as a mid more than a tweeter. 300-12 khz or so.
Then I use a true ribbon and/or a planar, depends..12 khz up..

No hard domes for me. A lot of the manufactures use them.. they suck.. simple..
I don't care who makes them...

Aurum Cantus is one of the best tweets top to bottom...Either Striction or Ribbon

I try to only use round speakers from 300 hz and down. It makes for a
VERY fast system...Ribbons, planars and domes, are all faster than any round/cone style speaker...

Regards
While I have never heard one, I believe that some would say speakers with a plasma tweeter have the best high frequencies.  
The one with all the cables and fuses in the correct direction. 🤗