Have you contacted Thiel? They recently rebuilt the tweeter/midrange driver for my CS2.4 I contacted them by email, received a RMA number, and sent the driver to Lexington, KY. 48 hours after they received it they had it ready to ship back. Worth seeing what they could do or information they could give you.
Thiel Tweeter issue
I have a set of used Thiel CS1.2's I recently bought cheap. Of course they were a little dirty, but at low levels sound great! At higher levels though, the tweeter sound harsh, and has got progressively worse. I am having an issue finding a 25TAC/GW-TH H420 60hm 26/90 tweeter replacement. Anyone know a solution? I would be willing to change both tweeters to match, if a different tweeter would be an improvement over the original. Any help would be great! thanks.