maybe ask it here: https://community.klipsch.com
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The original tweeter in all of these are the Klipsh K77, a Klipsch branded EV T-35. They are excellent tweeters. Originally, the diaphragms came with very fine wires attached, kind of like a human hair. They frequency burned out. But replacement diaphragms are available with beryllium/copper leads that will not burn out.
Replacing the diaphragm will be tricky for the novice, but is doable. Or one of the speaker repair houses can do it.
A big step up from the EV T-35 is the EV T-350. They are spendy on the used market and may require a bigger hole to be cut in the cabinet.
Bob Crites makes a replacement tweeter that a drop in and is based on a currently available horn tweeter. They are not to my taste but YMMV.
I have an old EV S12-S cabinet that may have a bad tweeter. It's the ST350A which has the round magnet like the older Klipsch K77. I replaced it once before. I emailed Bob Crites about it and he told me there are NO good replacement diaphragms for these at all. He said the one's on eBay are not very good.
The Horn measures 5" X 6" and I don't really want to cut into the cabinet to fit a replacement horn/driver. I want to use the cab for electric and acoustic guitar so it may not be as critical but I'd prefer to rebuild the original if I can with something that will last.
Has anyone heard a good replacement diaphragm?
I believe that virtually all of the diaphragms out there for sale are the Asian sourced parts. I have installed quite a few in T-35s and I am very happy with the results.
in one way, reliability, they are far superior to the originals. The original leads were super thin, like a human hair. The replacements have thick leads that don't burn out when conducting power. When you pull the old ones, it is inevitably the lead which is toast, not the diaphragm.
Installing them is not that easy, but if you have DIY soldering experience it is quite doable. Let's be honest, the EV tweeters are peaky no matter what diaphragm is in them, which gives them their characteristic sound which I, for one, like. I know, I'm deaf.