Hello mglik. Look for Raal tweeters. I believe Raidho uses them. Have you seen//heard the tweeters using video tape for the active element. I don't know who made them, but Radio Shack used to sell speakers using them. They are excellent, but at least 45 years old! Enjoy!
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.