Acoustic Zen - blown tweeter - out of business? replacement?

I have picked up a nice early pair of AZ Adagio and they have a tweeter that is not working. I have emailed AZ and no response. I have called them multiple times, they seem to have a cell phone as their business phone and the voice mail is the default message and the voicemail is full. I have tried to contact several dealers listed on the website and they either don't list the product any longer, the store no longer exists/no website, or they haven't dealt with AZ in a long time. So, any news out there? anyone know the fate of AZ? Surely they don't make that ribbon tweeter, right? Any clue who does? does not look familiar to me. Anyone used another tweeter successfully? Thanks for your help and suggestions.