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 Post subject: An interesting speaker problem
PostPosted: Apr Sat 25, 2020 11:21 pm 
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Location: Northwest Indiana 46350
Was fiddeling with some old speakers I salvaged and re-foamed a pair of 10" woofers. One speaker had a slight rub afterward and I was really ticked. :x Pulled back the felt cover and found a bulge/bubble on the voice coil. It appears to be a paper lining of some sort. I tried softening it with some acetone and pushing it back into place and it won't reliably stay flat. Not sure what to do??? Popping it in definitely fixes the rub. I figger I can either cut it out or try to slit and glue it down. The gluing kinda worries me as I don't want to let any glue run down and wreck it. Any idears???

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 Post subject: Re: An interesting speaker problem
PostPosted: Apr Sun 26, 2020 1:19 am 
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Joined: Aug Tue 21, 2012 1:19 am
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Location: Southern Ontario
Sand it off?

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 Post subject: Re: An interesting speaker problem
PostPosted: Apr Sun 26, 2020 4:48 am 
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Location: Aurora Colorado
Cut it out and fill the spot with some PVA.

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 Post subject: Re: An interesting speaker problem
PostPosted: Apr Sun 26, 2020 5:39 am 
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Location: Near Brandon, Iowa
Be certain that you know where the voice coil winding is relative to the "blister" before you attempt to slice it off.


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 Post subject: Re: An interesting speaker problem
PostPosted: Apr Sun 26, 2020 10:18 am 
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Joined: Apr Thu 16, 2020 10:10 am
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punch a bunch o small holes in it with a fine sewing needle,

after it's perforated, mask off the gap with some tape, get a small dab of super glue on the end of a small screwdriver blade, hold the speaker upside down over a lamp so you can see and pat that bubble down with the glue and hold it on place til it dries. then some 400 grit to sand any super glue ridges. unmask and vacuum gap.


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 Post subject: Re: An interesting speaker problem
PostPosted: Apr Mon 27, 2020 1:51 am 
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Location: Northwest Indiana 46350
I made a slit across the top, used a tooth pick to pry it open and dabbed in some contact cement. I didn't really trust super glue. Have no clue how in the world that bubble got in there, my guess is its always been there. One of those scratch your head moments...

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 Post subject: Re: An interesting speaker problem
PostPosted: Apr Mon 27, 2020 2:18 am 
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Joined: May Sun 13, 2012 8:12 pm
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Location: Central PA 16801
nice

i have done some interesting repairs over the years as well.

i have a big tombstone firestone. the speaker would not quit buzzing.

so, i took an exacto knife, cut a conentric circle around the cone right above the vc wires. i shimmed the voice coil with pieces of an index card. i then sealed the cut with elmers, put a layer of coffee filters on it and recoated that with elmers.

basically i "reset" the voice coil and the cone and the rubbing stopped.

it is as good as new.

steve

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