Nothing is sturdier than a ring radiator

Ok you and I are on the same page
JBL is replaced by the BEYMA Compression Horn tweeter. 
104db sens.
Yes sir, 
She's a  beauty.
any compression horn, does not matter (high fidelity type, not car audio crap) beats any dome, ribbon, etc etc tweeter.
This is what I am trying to get over on this board.
Im my book the only tweeter consideration is compression TI Horn tweeter,,all others do not even exist in my book.
Troels Gravesen is building <,dinasaurs >> in his lab. 
https://usspeaker.com/beyma%20CP25-1.htm

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.

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

@erik_squires --

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

As in, exposed to what - time, power, pokey fingers? In these areas regardless nothing beats a compression driver; its diaphragm in concealed inside the whole of its mechanism, they usually take a lot of power (while not least being the most efficient driver type to turn it into actual sound), dissipate heat effectively, and are extremely reliable even after decades of close to abusive use. 

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. :-)