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Old 4th September 2008, 06:40 PM   #1
Vivek is offline Vivek  India
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Default Coating coated paper cone

Hi all,
I got two pairs of polymer coated paper cone midbasses. But the rubber surround was getting unstuck from the cone. So I thought i would try to fix it and applied a rubber-based glue. Sadly, the whole thing got messed up. I then used a cyanoacrylate super glue to stick it up. But the cone is a bit of a mess. Could anything be done to restore its looks? I was thinking some diluted PVA glue would help. Or should I just forget about aesthetics and use them as they are.

Thanks and regards,
Vivek.
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Old 4th September 2008, 08:59 PM   #2
SaSi is offline SaSi  Greece
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Applying PVA or something else on the cone might cure any visual problems but will give you a different driver with different characteristics.

Basically more mass and less compliance.

I have read somewhere that glueing specific addons to the face of the B139 driver was some form of art in designing TL subwoofers with that driver. Experimental and black magic.
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Old 5th September 2008, 06:05 AM   #3
Vivek is offline Vivek  India
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So it's better that I live with a driver that does not look so good rather than spoil the sound qualities of the driver, right?
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Old 5th September 2008, 07:45 PM   #4
SaSi is offline SaSi  Greece
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You will probably spoil the mechanical properties. But this treatment, if you know what you are doing and are able to experiment, could - in theory - give you a more suitable driver for a particular application.
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Old 5th September 2008, 08:39 PM   #5
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Vivek,

If you apply one or two thin layers of rubber based treatement (only on the cone, not on the surround), the added mass will only eat a small fraction of a decibell on the entire fr range...not audible.
I used Visaton LTS 50 with great success (twelve layers resulted in -2db)
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Old 7th September 2008, 08:01 PM   #6
Vivek is offline Vivek  India
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Hi,
I have a pair of drivers which I use for experimentation. I coated the cones with PVA glue and found that the layer is very thin.
Yesterday, I went to the electronics market and spoke to a guy who is running a speaker recone business. I asked the guy what glue he uses to stick cones. He even led me to the shop where the glue was available. The glue seems just like the other rubber-based adhesive but easier to use.
I was thinking that I would give the cones one layer of PVA or rubber glue and use them for the rear surrounds and the centre channel. I could get better drivers to build front MTM speakers for two channel audio and home theatre. What do you guys think?

Vivek
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