I have read through this thread with great interest! I already have a pair of driver using the AMT concept (Beyma TPL150H) and I like them a lot, but unfortunately the Beymas cannot be used below app. 1,500 Hz, and stacked, original AMTs may be the way to go!
BUT I cannot help asking: If two stacked (and horn loaded) AMTs are excellent, then what about 4 stacked AMTs per side? Obviously, power handling/sensitivity and max SPL would be improved, but maybe more importantly: Would 4 stacked AMTs lower the crossover point - and if yes, then how far down?
I would really appreciate your thoughts on this (pros/cons? - besides being more expensive for sure!), and in case anyone buying 4 AMTs tried this, I would very much like to hear your experiences!
PS: I think Pete H already stated the question, but I do not think it received any answer (or I may have overlooked it)!