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In Reply to: Re: Problem with Dynaudio 17W75XL posted by RBP on June 17, 2002 at 20:23:02:
Thank you so much! That was extremely useful! I'd have to get the woofer out to check if it's the L series.
Silicone glue is typically too thick to dispense from a syringe. But, supposedly you can thin the stuff. I read about thinning in an older issue of SPEAKER BUILDER magazine. But I'm not sure which solvent works best. I've used Lacquer thinner alright, and then poured the thinned mixture into a disposable monoject.
I personally don't think that silicone glue is strong enough in this application. Better make it epoxy!
Silicone RTV (GE Clear) works fine Æ, never had a problem with the syringe. Warning: Have you ever mixed 2 part epoxy (hobbypoxy) and added it to a 17W75 cone while curing? Thought not. It chemically reacts negatively to the cone..warping it. The epoxy dynaudio uses in their voice coils is fully cured and baked before applying the voice coil to the cone (using LX6B). Epoxy (if it did not melt the cone) will harden to brittle and flake off in the voice coil gap! Silicone RTV is used to glue huge aquariums together. It is much stronger than any force the 17W75 could muster. It stays just plyable enough..will never become brittle. Sticks some RTV to aluminium. It is VERY strong.Tell you what, how many 17W75 cones have you applyed epoxy to? I did one, it ruined it. Reminds me of the sugesstion to use "roofing bull" as a dampning agent inside a loudspeaker enclosure. Watch the cones melt from the chemical reaction.
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Actually I've hardly ever used anything by DYNAUDIO, but have plenty experience fixing all sorts of drivers. There are a wide range and variety of epoxies to use. The trick is using the right one. Of course your experience suggests caution, don't want to melt a cone. The epoxies I use don't "flake" or "brittle". The brittle part probably occurs when exposed to long term UV. I never subject any of my woofers to long term UV exposure from direct sunlight!
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