Tastes vary, but I would say it would have to be the one playing Jennifer Warnes.
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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...
ESS was a good one too. Actually a great topper for the older boxes
Didn’t JBL used something like that too. Not real savy on JBLs.
AMT an older JBLs? 45 years ago, or more..
I know, I like the sound of JBL. Just I couldn’t afford what I really liked.
+ 1 more for Mrs Jennifer Warnes can we add a few more?
I've not heard it, but if that's the Beyma AMT I've read from many a DIY'er it is among the best performing tweeters in the world. Great dynamic range without compression, very low distortion, and the horn adds controlled dispersion, guaranteeing a clarity at the listening location you are unlikely to find anywhere else.
While not AMT's are created equal, some manufacturers use really awful versions, they all share in low stored energy, the equal or better of Be or diamond tweeters in this specific regard.
B&W diamond tweets are not nearly as natural. If you've ever walked into a store and said "Oh, I hear a B&W speaker!" you know what I mean.
I’ve tamed the Heils and they sound great with plenty of top end extension. I use them in a 2.5 way with JBL 2241H 18" and JBL 2251J 10". My own design crossovers.
I created acoustic lenses for them and insert a piece of foam to the rear to reduce reflections improving imaging. Here you see the RTA on the couch where I sit. There is no eq or digital processing of any kind being used here nor is the room acoustically treated in any way
Curve is actually a bit smoother at the top than shown due to additional crossover mods I’ve made since. Ignore the "floor/wall bounce depressions" at the low end.
Note this is ~+-5 dBA from ~32 Hz to beyond audibility (with a nice smooth curve) on the couch with no eq or room correction being used! And no woofer foams to ever replace.
Take a listen:
An AMT tweeter is like a bellows it’s surface area is 3-4 x it total
dispersion area that is why it too has a wave guide .The Spatial use a huge AMT to cover midrange on up ,where others use a specific driver just for midrange which ion a $$ speaker is more costly like a Accuton driver, which also use a diamond particle tweeter which is $$ but very accurate. The spatial is very good
upgrading or requesting a Xover upgrade will bring Huge results most everyone skimps In capacitors resistors , Path audio best made period but $30 each , vs $3 ,and many upgrade capacitors available. Inductors like a Jantzen great quality,value not too costly
but many use cheap bobbin type or called sledge hammer coil of
wire around a magnet 🧲 you see this often in many under $10 k
just to save under $100. Just for the record when ordering ask to
have Xover upgrade options humble homemade Hifi capacitor test gives a very good comparison for modt caps.
Spatial uses a Beyma AMT made in Spain which is very good
other companies use a smaller AMT just for upper frequencies like Monitor audio for example Their pl500 can go up to 100 k which is class leading ,even their studio can go to 60 kHz which is like a super tweeter.
Having heard several variants on plasma and ion speakers back in the very early days of HP's Absolute Sound evaluations (back when the "magazine" was little more than a dozen pages, stapled and folded). I'd have to say that they reign supreme; however, they have never been practical commercially.
Of those designs that have survived as commercial products, electrostats (martinlogan, dayton-wright, others) and magnetic ribbons (Heil, Magnepan - different, yet similar in principle) are probably the best.
I fell in love with the original CLS speakers playing string quartets when I first heard them. And, I owned a pair of Monolith III's that I bi-amped using the Dahlquist DQ-LP1 active crossover.
I've been following this thread with interest but waited to comment. I was wondering when and if the Magnepan true ribbons would be mentioned. I have never owned any of the top tier speakers. I've auditioned just a few speakers that retail north of 10K. So I'm not really in a position to speculate on "the best" tweeter. But I will say without hesitation that the best tweeter I have heard is the Maggie true ribbon. It is the one thing I really miss since moving away from Maggies. The tweets in my MG 3.7s were heavenly. They never got overly aggressive. They were very resolving, free of grain and breakup, sweet as honey and smooth as silk.
Magnepan 3.7 WOW I forgot about that speaker. That is a really good speaker. I heard the 3.7i with Mac C50 and SS MC601s (I think). He was selling the C50. I was really impressed. Did't buy the C50, sure was tempted to make an offer on the MG 3.7i though..
We listened to Strunz & Farah "Rainmaker". WOW! Top 5 best production speakers I've ever heard, excellent indeed.