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Old 24th March 2014, 03:57 PM   #1
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Join Date: Mar 2014
Default Re-seal fabric tweeters

Hi all,

I have an old pair of Tannoy Mercury M2s that I haven't listened to with a critical ear for some time spending much of my time on the road. Inspecting them I note that the varnish covering the tweeters has flaked off though the fabric underneath is sound. Will this be affecting the sound I'm getting (which for my feeling is a bit duff compared to my memory of them)? Is there any product I can use to reseal these? I'm based in NL. Household products appreciated to minimise cost, my wife would rather I dumped them and bought us something with an iPod dock .... Many thanks in advance
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Old 24th March 2014, 06:26 PM   #2
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Join Date: Feb 2006
Location: Cascais
Soft Dome Tweeter Coatings

Last edited by Inductor; 24th March 2014 at 06:28 PM.
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Old 24th March 2014, 07:03 PM   #3
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Location: Hungary
As others point it out correctly, most textile domes are not "doped" from the outside, but immersed into the sealing compound, which is usually a secret formula for each manufacturer. However there is one material that I used with good succes on many textile domes, sometimes giving even a better overall sound than their original coating. It is similar to the standard "white glue" -what is generally PVA (Poly-Vynil-Acetate), but the so called "sticky" version of it. The difference is, that while the standard version has a kind of "rubbery" touch when it dries, this one remains sticky, as its name suggests. This means that it remains viscous (like the back of a packaging tape or self adhesive foil), therefore its resonance damping properties are very good. If you find some, try to remove the original coating as well as you can (do not use organic solvents, as they might dissolve the voice coil glue as well....), using ear cleaning sticks with Isopropyl alcohol, then apply two thin layers of the sticky PVA with a soft brush in about two hours after each other. One drawback however; it will collect dust rather fast if left freestanding without some kind of cover.....

Last edited by dragonweed; 24th March 2014 at 07:08 PM.
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Old 6th August 2014, 11:08 AM   #4
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Great, thanks for the replies guys. I'm going to get right to it
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