Boston Acoustics A400 were previously refoamed with rubber glue. Difficult removing the old glue.

[cflora]

I recently purchased a pair of Boston Acoustics A400 speakers which I was told were refoamed. When I went to look at them, I noticed that the surrounds were not the proper filleted surrounds recommended for these speakers. The price was right, so I bought them anyway.

No problem, I ordered the proper surrounds and figured I would just redo them. When removing the old surround, I noticed that the guy who repaired them used a black rubber glue, not the usual white glue that is more easily removed.
The problem is, I can’t remove the rubber glue. I’ve tried peeling, scraping, isopropyl alcohol, and heat from a hair dryer. Nothing is working. It’s like the glue has bonded with the paper cones.
I’ve included a picture of the glue on the cone.

Any suggestions on how to remove the glue would be greatly appreciated.

Thank you

Chris

 

[homebrew]

Have you tried acetone?

 

[Blue Shadow]

I’ve used a wire brush on a Dremel and been able to remove tough glue from the cone. One caution is that the brush must always be rotating from the cone off the edge, never toward the cone edge because if it catches the cone might be time for a new cone.

 

[cflora]

Have you tried acetone?

I haven’t tried acetone yet because I’ve read about the danger of harming the cone. I’m not ruling it out though, especially if nothing else works.

 

[cflora]

I’ve used a wire brush on a Dremel and been able to remove tough glue from the cone. One caution is that the brush must always be rotating from the cone off the edge, never toward the cone edge because if it catches the cone might be time for a new cone.

I do have a dremel and saw a demonstration of that. Since the glue is rubbery, I wasn’t sure how effective that would be. I’ll give it a try.

 

[Blue Shadow]

The glue should get stringy on the wire brush as you carefully start taking thin bits of glue off. Go around the driver a few times to get the full depth of the glue instead of digging deep from the start. Might have to clean the brush a few times.