Dunlavy SC IV A harsh high frequency


I have owned my SC IVA for many years. I replace the blown tweeters at least once a year. I know the original set were carefully matched at the factory but I can not duplicate the tecniques which John used in his shop to optimize response. The speakers sound glassy and I wonder if this is as a result of tweeters I have installed but would have been rejected by John. I have done a lot of work with room treatment,changing source, components, etc...
Are there any recommendations for fixing this issue?
Replace the Vifa tweeters with more expensive ones?
Thanks
128x128shumi
Swampwalker makes a very good observation :-) especially with a first order crossover design like the Dunlavy where the crossover offers very little protection for the tweeter as far a power handling goes.

Dweller, I don't think Dunlavy used Electrolytic capacitors in at least the tweeter section of the crossover, I would assume that he used polypropylene capacitors which have a much longer lifespan than the 10 years you mention. Below is a link to a informative description on a XO modification the the speaker

Dunlavy X0 Modification

Best of Luck

Peter
I ended up using the Seas Excel T25CF-001 tweeter. It spec'd out to be a perfect match to the stock tweeter.
I switched out the original tweeters to the Seas Excel after reading about Jade's modifications. I'm glad I did.

BTW: I've never blown a tweeter. If you're replacing them once a year something's not right.
Thanks for the responses guys. I am indeed concerned about my hearing. I have done a lot of bird hunting and I fear my right ear may have some damage. I need to have it checked for sure. I also listen to concert videos at 80dBs. My right front speaker blows a tweeter more than once a year. I have loved these speakers for many years but it may be time to let them go. My 9.4 system is made up of:
2 SCIVA s front LR
1 HRCC center
4 SCIII rear and LR surrounds
2 SCIs for front wides LR
I agree with Rja. Something is definitely not right if you are blowing tweeters at that rate. I have just about every speaker model John ever designed and most of the units have worked perfectly for many years without replacing a thing. I have a special attachment for the SC-IVs. I hope you can find a solution without feeling the need to replace them. I have an HT set up very similar to yours and find the synergy of an all Dunlavy system to be amazing. I am curious about your electronics??