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Old 2nd February 2013, 08:29 PM   #31
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Join Date: Jun 2002
Location: NH, USA
Quote:
Originally Posted by djk View Post
PVA is nice, it remains flexible when it sets up. By thinning it out and applying several coats you can control the build up quite well.

You have me wondering about a cloth, I wonder if something like a cheesecloth would be suitable?
Does PVA remain flexible for awhile? I know silicone does. I don't know what to use.

What about this KLH is redope of surrounds needed? - Page 2 - AudioKarma.org Home Audio Stereo Discussion Forums :

"Permatex (diluted with lacquer thinner) was the first material we experimented with over at CSP a number of years ago, as it contained a butyl compound similar to what we were looking for. Although it remains tacky for awhile, the gasket sealant eventually forms a membrane....which is the problem with virtually all of the compounds discussed in this forum. Once a membrane forms and stiffens, even to a slight degree, fs increases (sometimes dramatically) compromising the design basis of the acoustic suspension woofer. I have tested and measured many compounds over the past 5 years, and negative results have been consistent.
(Actually, a thin application of Permatex is not bad compared to most other materials mentioned along the way.) It is very often better not to apply anything at all, especially if the speakers are not being pushed to higher volume levels.

After input from a number of knowledgeable sources, including Roy Allison (early AR and Allison speakers...who is in his 90's now), I was able to come up with something much like the original compound. It is nasty to make, and is essentially the same tacky stuff manufacturers used to use to treat ("dope") driver cones and domes to modify response characteristics. It is a non-drying butyl compound diluted in toluene.

Due to the high percentage of toluene, and little demand for this kind of compound today, a commercial product of this type is not readily available.

Vintage AR/Larry Lagace is the only "retail" source of the stuff. AK and CSP forum members are welcome to send me a PM for more information."

-RoyC
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