I'm looking to learn about Air Motion Transformer technology

A lot depends on the quality of the AMT ,in the Wharfe Dale 
maybe $50 each  top AMT can go over $400 each the bigger ones 
operate from the midrange to high frequency , I have had Dayton $70 AMT that were ok but lacked refinement, I have a Monitor audio Studio , which took a lot of technologies from its $25k flagship and its very refined and reasonably priced under $2k 
since I rebuild the Xover even in speakers over $14k many times it is the weak link using cheap Xover parts  just to save money .
80%  of speakers under $10k use what I consider at best average grade a Xover parts. Since it is the heart of your Loudspeakers 
everything goes through there are greatly determines the detail and refinement you get. I had the owner of Harbeth hang up on me 
when I questioned him on a $4k speakers using $3 Taiwan capacitors, being in the U.K. another $100 and using local Clarity capacitors would gain much more realism that is just one example 
even the $80k Martin logan using under $10 capacitors , I called them on it ,when spending good money like that you should get the top Of the line brand they choose to use. Makes no sense to me have some pride ,to me I would rather pay a little more for higher quality ,or just upgrade the Xover  .

The latest Elac  Jet 5 AMT Tweeter is made in Germany where the original AMT tweeter was developed not China like most,it is exception very fast ,detailed and very smooth using Neodymium magents all around 
and and folded pleated diaphragm . This works like a bellows,for the  folded tweeter they use a robot To solder the contacts to the mem brain .i believe theyuse a treated mylar membrain  it is very well thought out and complements their excellent mid-Bass crystal composite driver 
Aluminum  facet.sandwich with a pulp paper rear using 3 types of  adhesives  glue mid Bass driver  the Oder Elac I was not a big fan the new Vela seres Excellent .