Nothing is sturdier than a ring radiator

but I thought this was about reliability first and foremost ;)

It was, until it became a platform for compression driver feitishism and I had to say something.

I've seen Altec compression drivers blown by 75 watt amps and not overdriven, so not so sure that they are that much sturdier.

Besides, I've never heard a compression driver that sounded worth having, so I didn't think about it. :-)

Just a reminder that the subject of this thread was reliability. :)

I had the chance to talk to an engineer from Raal a couple of years ago. Brilliant guy.  One of the great features of the Raal true ribbons is they can alter the transformers to suit, and you can use 1st order high pass filters if you would like.

Anyway, he was very interested in the Mundorf performance and he walked me through how to measure it, especially compression and distortion.  We both agreed the Mundorf is pretty spectacular a performer. If you want to dig up that conversation it is somewhere at DIYaudio.

Here is a good explanation why AMT aka Ribbons

AMTs are NOT AKA ribbons, therefore your premise is bunk. AMTs work on completely different principle, have different motors, vanishingly low distortion and stored energy and impedance characteristics and the conductor and the radiator are not the same material in an AMT. About the only thing they have sort of kind of in common is the effective radiating area is square or rectangular which makes them kind of similar in radiating patterns. If you keep saying AMTs are ribbons, it’s like calling every black car a Mercedes. AMTs are built differently, measure differently, perform differently and are far less delicate than ribbon tweets. Everyone who universally conflates a "ribbon tweeter" with an AMT really has no idea what they are talking about.

In addition to being built entirely differently, the top end Mundorfs have wildly better measurements, including frequency, distortion and lack of thermal compression than a ribbon tweeter. I mention this brand because there are many cheap AMTs which do not perform as well. I’m specifically talking about the high end examples such as from Beyma or Mundorf when I praise their performance.

Try again. And again.

You poke it with your finger. :D 

Be and Diamond tweeters are notorious for breaking apart, so don't do that.