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Old 10-16-2015, 08:52 AM
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Default Refoaming Poly Cone Subwoofer - Questions

I ordered a new foam surround with shims and glue for a poly cone from Midwest Speaker to refoam my old Mmats 12.

My questions are:

1) What is the proper way to clean the old foam from the cone (what cleaner to use)?

2) I was also told to leave the old foams adhesive to use as a primer for the new glue on a poly cone (not by Midwest) is that right?

Any help is appreciated.
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Old 10-16-2015, 09:12 AM
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I sanded the surround edge off my DD composite cones with a dremil. That worked pretty good
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Old 10-16-2015, 03:59 PM
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Quote:
Originally Posted by adulbrich View Post
I sanded the surround edge off my DD composite cones with a dremil. That worked pretty good
Did you leave any of the old adhesive?
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Old 10-16-2015, 09:27 PM
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Did you leave any of the old adhesive?
I did leave a little bit, but wasn't trying to. I didn't want to dig into the kevlar or take the resin off with the sanding bit
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Old 10-16-2015, 10:20 PM
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I carefully used the small wire wheel attachment on my dremel to clean off an old Jensen 10 poly cone. Used a fairly low speed if I recall (this was quite some time ago). I know, cheap sub, but didn’t hurt the cone any; it did remove all the adhesive.

Whether is works on your Mmats is another question.

Might be able to rub most of the old foam off with your fingers and leave much of the old adhesive.
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Old 10-16-2015, 10:26 PM
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Ok I will likely try to leave the adhesive and see how it goes here in the next couple days. I am going to try to do the refoam without pulling the dust cap and using shims, hopefully it works out.
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Old 10-17-2015, 04:31 AM
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Without shimming, it will be a gamble. Very difficult to get the voice coil centered in the gap that way, and high risk of rub; it may not be noticeable until high Xmax. Not saying it is impossible, but high probability it will not be centered.

Not sure what style dust cap that has, but if it is factory, it is likely a rubbery adhesive holding it on, heating the glue joints of the cap (high heat setting on a hair dryer for a while) and slipping the end of an old credit card under it may get it off without cutting. Also may help to sand the edge of the card so it is sharper. Ive almost always been able to remove factory caps without cutting it / damage. I would personally try that first to see if it starts to work, as shimming the coil would be best.

But if you feel like it will be damaged, could go for it without shims.
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Old 10-17-2015, 05:12 AM
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Yeah, I am debating it still, read/viewed a good tutorial for refoam without removing cap and shimming.
Resurround Step-by-step

Rick Cobb supplies a test disc with each surround just for this scenario.
http://stores.ebay.com/looneytune2001/
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Old 10-17-2015, 09:15 AM
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Well it looks like I am going to have to pull the dust cap, this isnt a heavy duty subwoofer so it has a soft spider and there is too much movement to do it without shims.... Damn it!!!
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Old 10-17-2015, 11:43 AM
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Quote:
Originally Posted by only126db View Post
Well it looks like I am going to have to pull the dust cap, this isnt a heavy duty subwoofer so it has a soft spider and there is too much movement to do it without shims.... Damn it!!!
I saw that video in the past, and thought that probably keeps him in business with recones.
I think dust cap off and shimming is the only way to go, especially if its a tight gap motor.
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