I would suspect the caps too. Is the problem in one speaker or both? These are fabulous tweeters (the same ones used on my Gallo Ultimates) and I'ver never heard or read of a problem like this. Good Luck.
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Both tweeters are down in output.
I received the caps & solder in the mail yesterday and am waiting for the plastic rivets to come from Gallo so I have a little time to practice before opening them up. My concern is that it's not just the extreme h/f that's missing. The sound volume level coming out of the CDTs is a small fraction of that from the woofers with my ears inches away from them.
Could it be the resistors are damaged too? What else could it be?
What are the Ultimates like, don't think I seen them before.