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

I don't know anything about your speakers.

You might get lucky,

the problem might be inside, a crossover component or connection,

I just restored AR-2ax’s, and one of the new capacitors I installed was bad, juice up to it, nothing on the other side. Parts express overnighted replacement, tweeter was fine.

Also, a wire nut someone had installed within had jostled loose during shipping, easy to check, find, fix. I changed the wire nuts to bullet connectors.

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IF it is the tweeter, you might also replace both tweeters with ’better’ ones. i.e. get help from Madisound, .... My JSE Infinite Slope Model 2’s: I replaced my Dynaudio D21’s (they burnt out too easily, common problem with that model) with some Focals, blended/sounded terrific, and ferro-fluid never burnt out.

IF it gets tricky, I presume you have the original specs of the speakers/whatever details you can gather, and you have the good tweeter, you can remove and measure it's resistance, get all the clues you can.

You can remove the woofer(s) photograph the crossover parts, test the crossover parts

Wish it was a loose connection, or a bad crossover... Acoustic Zen soldered all connections and used very nice wire.  I have several tweeters on hand and connected up a polk tweeter and laid it in the hole, it works fine so I know the tweeter is the only problem.  Still haven't gotten through to the company, their voicemail continues to be full.  Thanks for your thoughts.

If you get desperate, you could try tracking down this unit. This site looks kinda sketchy, so I'm not sure I would purchase from them, but the product name leads me to believe this could be the same unit with a different mounting plate ( square vs. Rounded corners).

https://www.v2mshop.com/?product_id=256413225_52

That link leads to socks and underwear.

I doubt AZ makes their own drivers so have you gone to madisound  to compare tweeters?  Maybe checking the resistance of the working unit can help narrow the choices