What speaker has the best tweeter?


I love the AMT tweeters in my speakers. They are definitely different from other tweeters I have heard. I enjoy their openness and air. But there are qualities of other tweeters that excel in other ways. Some v pricy speakers use beryllium or diamond or diamond coated beryllium. I see that the price of, Seas I think, diamond tweeter is like $6K a pair. Then ribbons offer used. Not to mention plasma, etc.
mglik
My Tetra 606 speakers use a Mundorf bi polar AMT tweeter.
(and an ATC dome midrange)
They are very open and airy.
You need to be careful to avoid high frequency fatigue.  Fortunately I went back to listen for two hours to a pair of Martin Logan Motion 60’s with ribbon tweeters.  To date I have not listened to a better pair of speakers than a pair of SALK Sing3 Encores.
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Magnepan owners (and others) think very highly of that company’s current ribbon tweeter, used in the MG3.7i, 20.7, and 30.7. The long-discontinued Tympani T-IV and T-IVa also used an earlier incarnation of basically the same driver.

The Townshend Audio Super Tweeter---a pure aluminum genuine ribbon---sounds great (I heard it in use on top---physically and sonically ;-) ---of Magicos), electronics feeding it an ARC Anniversary Reference pre and VTL power amps), as does the NEO3 magnetic-planar tweeter from GR Research.

Way back in the 1970’s the RTR ESL tweeter was used in some of the great loudspeakers of the day (the ESS TranStatic, Infinity Servo-Static and 2000A, Wilson WAMM, and Fulton Model J), and still sounds pretty darn good.