Sorry to hear about this and my response will not help. You will see from my threads here on audiogon.....I had a pair of the Eclipse's for over 10 years and bought them demo from a dealer. Loved those speakers....and really without dropping allot of money listened to other speakers but still kept my Avalon Eclipse's. I had discussed the Eclipse's with Lucian at Avalon many times - and I believe it was one of their best efforts and also designed by Charles Hanson who is now at Ayre. There was something about that sealed enclosure. Anyway, when I heard that that Avalon no longer had replacement tweeters and they did not have a '' work around '' in place, I sold my Eclipse's here on Auduogon last fall. Not because I WANTED to, but I felt that I had to because if one of those tweeters went, they would make awfully big book ends or door stops....pre-emptive on my part, yes, but I got $3,000 and mine were in MINT shape. Fantastic speakers and too bad Avalon does not have a replacements ( although, they once did and obviously they are now gone ) as I would have definitely have kept mine. Stanwal is correct, in that any replacement would have to match with the existing crossover..... good luck and wish you the best !