Hi,
I bought a pair of A-25s. They seemed to have never been opened before because when I was sussing the issue, the glue was all in place. I run a ST-70 and a PAS-3 (and Hafler 101).
One of the tweeters cut out. Thought it was blown. Opened cab. Tested all resisters / caps. They all are good. I tested re-soldered connections to speakers. Used the battery test. Everything checked out. Reconnected speakers. Tweeter worked. Then cut out. I repeated the process. Tweeter worked. Then it didn't. In fact, as I was typing this, it just happened again (thought it's been stable for a few hours). Very frustrating because I can't tell what's causing the issue. Everything seems to work until it doesn't, and there's no obvious problem/weak spot. Then, one time, when it went out again, I did the battery test by disconnecting the speaker cab cables from the ST-70 to check that tweeter wasn't blown; it wasn't. When I reconnected the cables, it worked again. So now when it happens; I've been doing that process: disconnect cable from ST-70 > Battery Test > Reconnect Cable. And it always works. Until it doesn't. It was stable all day today, but as I typed this, it's happened 2x. This last time, as I was disconnecting the ground cable, the tweeter worked. So then I sat down type, and it went out again. So I just disconnected and reconnected the cables without the battery test, but that didn't work. So I did the batter test, and, yep, the tweeter works again. For now.
With my other speakers (KEF Q series), this problem never arose, so that confounds me further.
Anyway, thoughts at all on what this could be?
Thanks!