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Repairing a Celestion 15 inch speaker?

Someone threw something at this speaker in a Carlsbro Cobra combo. It works with distortion. By digital probing (using my fingers) at about 4 o'clock position , unpowered, the rubbing resistance feel to movement of the cone disappears. Same if powered up, no distortion, to a power level where the effect of my fingers damping comes into play. Is there a liquid that will contract on drying to paint radial stripe on cone and dry and test, repeated until problem goes plus one or two more stripes.? Or would freeing the rim or part of the rim of the cone by hot-air heationg and reseating all or part be better. If part then release 2 to 6 o'clock say and pull or 8 to 12 o'clock and push, my guess is pull would be better. Any other ideas? rather than throwing out at this stage, if it doesn't work then just lost a bit of time and learnt a bit maybe.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook
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I have heard of minor cone tears being treated with ladies nail varnish. Professional reconing is an option. Celestion still exist as a company and may be able to advise

Reply to
mike.j.harvey

If it's a pressed steel frame, you can sometimes recover such location-specific voice coil drags, by deliberately distorting the frame in the opposite way, so that the cone is recentralised. Crude, but often effective.

Arfa

Reply to
Arfa Daily

the solution is to move the cone assembly sideways a tiny bit, not at the rim but near the centre. If you can unfix thespider and then centre it, problem solved. If not, other than reconing, putting sideways force onto the cone assembly can bodge it and make it work ok. This is done by makeing a hook shape and sinking the short sharp end of it into the spider, and pulling and fixing to the frame. Its a bodge, but you might want to do it to try to avoid a recone.

Dont repair cone damage with rigid materials like nail varnish, the varnish etc will break after a bit and then the whole thing sounds terrible. Always use a flexible glue. It does need to be a strong glue.

NT

Reply to
meow2222

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Didn't expect it to be so easy. The central dome was buckled in. Drilling a few 1mm holes and using a dental sickle brobe managed to pull it back into reasonable shape. Somehow that corrected things, just a small puncture in the cone periphery to patch over now.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N Cook

I trust youve sealed up the little holes, that needs doing else muck gets in the very tight spaces between cone and pole magnet and the speaker's then stuffed.

NT

Reply to
meow2222

Try to find some Plio-bond. Apply it to the edges of the tear with a toothpick and carefully fit the tear back together. If you have a small piece missing, make up a patch to fit using construction paper and glue it in place. You said puncture, so I'm thinking all the paper is still there.

Don't use Elmer's glue or nail polish; they're not very flexible when they dry.

-Dave

Reply to
Dave Curtis

Reply to
hrhofmann

Actually, many parts of the cone that seem stiff will flex quite a bit when the speaker is driven hard, not just the surround.

-Dave

Reply to
Dave Curtis

At EAW before they got, um, 'LOUD', we used to treat 5" mid speakers with a 95%/5% mix of Elmer's and water. The water would break up the Elmer's enough to flex. Later, we found another 'wood based' glue (forget the name) and did the same mix ratio, with alot better results. I used an old 78 turntable I'd place the speaker on, and set it at 16...and paint..faintly.

The folks at RCF speakers came over, saw the setup and told me they did the SAME turntable trick in Italy. AWESOME folks..

This 5" speaker would then drive the wood formed mid 'horn' of the cab, and increased mid range response big time.

KF at EAW is on the level of Leo N Jim, HP and D Reeves, or any other ICON in this business. Great guy, taught me alot.

Taught me how to re-cone speakers in mass qualities..the right way..

JJTj

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I am frolicsome, I am easy, Good tempered and free, And I don't give a single pin' me boys What the world thinks of me.

Reply to
OLDFART

Why not just brush paint it in situ? Thats what I did, cba these days though.

Re somene elses comments earlier, all parts of the cone assembly flex in use, just some more than others.

NT

Reply to
meow2222

Why not just brush paint it in situ? Thats what I did, cba these days though.

Re somene elses comments earlier, all parts of the cone assembly flex in use, just some more than others.

NT

Reply to
meow2222

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