Hi everyone,
to clean the gaps of my 2405 alnico tweeters, I've disassembled them. Strangely, they both present an almost symmetrical, concave relief on more or less 50% of the internal part of the diaphragm. I do not see any external cause for this relief and I have not found any other example of this situation on the net.
I have attached a picture of the diaphragm with arrows. Does anyone have an opinion on the matter.
Thanks a lot in advance for any reply.
Jean-Michel