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Old 09-11-2014, 12:29 PM   #1
joeldemeritt OP
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Fixing blown speaker

Got a subwoofer in part of a CL pakage deal with a bunch of other speakers, and was told it was blown. Cones are untorn, and the thing appears to be in good shape Makes no noise when connected to receiver (with polarity reversed too) took it out of the housing and tried the 9V trick on it. Nothing; so...

1) I can't find an explanation to why this happened
2) is there a fix worth doing to a ~$30 unit?

Thanks in advance
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Old 09-11-2014, 01:19 PM   #2
rob feature
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Voice coils can overheat & weld themselves to the 'motor'. Or they can separate & open the circuit. Try pushing inward on the cone (the part attached to the surround - not the cap). It'll probably either feel scratchy or stuck.
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Old 09-11-2014, 01:32 PM   #3
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yep. the voice coil is broke. but don't toss it. remove the cone, take a big ass hammer and knock the back plate off by hitting it in the center where the cone was. then carefully take a chisel and tap around the magnet until the glue turns loose. Then you have one hell of a magnet for what ever you can think of to use it for.
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Old 09-11-2014, 07:41 PM   #4
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It is more than $30 to re-cone a speaker.....
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Old 09-11-2014, 09:08 PM   #5
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Sounds like this one is beyond hope but FWIW you can check the voice coil of a speaker for opens and shorts with an ohmmeter, typically if good they will read about 2/3 the impedance rating....i.e. an 8 ohm speaker will read about 6 ohms, etc.
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Old 09-12-2014, 12:12 AM   #6
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It's been 20 years since I've played around with this stuff so here goes.

the driver (loudspeaker, the physical device that makes the noise, not the whole box) could be bad
Or the wiring in the box, cross over or what ever else they have going on in there.
You got to figure out which one it is.

I would test the driver out of the box just to see if it works, Maybe you already did this. Check the impedance while you are in there.

Then I would use a multimeter to see if there's anything coming from the leads in the box when it's hooked up to a known good source.

If it's the driver that's bad. there are places where you can get a new one, often pretty decently priced, but most likely more expensive then what you have in your hand.

So fixing it is going to be more of an exercise in fixing it then one of saving money.

And if you're going to do that why not do it with a loudspeaker that is higher quality.
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Old 09-12-2014, 06:00 AM   #7
mud
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One quick test to see if a voice coil is OK.

Put a nine volt battery across the terminals (with correct polarity, the positive is usually the mark one on a speaker), the speaker will give a tock noise and move. If it does and when you move the speaker with your hand and it is smooth, your problem is not the speaker.
Do not leave the battery on the speaker for more than just a quick second or two.....
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Old 09-12-2014, 06:27 AM   #8
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[QUOTE=joeldemeritt;25052948] took it out of the housing and tried the 9V trick on it. Nothing;
[/QUOTE]

Quote:
Originally Posted by mud View Post
One quick test to see if a voice coil is OK.

Put a nine volt battery across the terminals (with correct polarity, the positive is usually the mark one on a speaker), the speaker will give a tock noise and move. If it does and when you move the speaker with your hand and it is smooth, your problem is not the speaker.
Do not leave the battery on the speaker for more than just a quick second or two.....
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Old 09-12-2014, 08:27 AM   #9
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Pushing in on the cone causes some scratchy sticky kinda sound. Might just go with switchblades suggestion; I have an idea where I could use them.
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Old 09-12-2014, 08:46 PM   #10
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damn. i had a link to a replacement speaker supplier and this would have been a great place to drop the question: are they any good? but it was in the history of my crashed opera browser.. and i can't remember the name.

i have a big pair of cheapo fishers and a big pair of nicer Pioneers that both need 12" woofers. the fishers i would send to work for the idiot kids to abuse but the pioneers i'd keep at home.
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Old 09-13-2014, 07:32 AM   #11
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Depending on how much you want to keep it and what it's worth, www.partsexpress.com has a bunch of replacement drivers.
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Old 09-13-2014, 08:14 AM   #12
andruboz
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Depending on how much you want to keep it and what it's worth, www.partsexpress.com has a bunch of replacement drivers.

thanks. it might have been the goldwoods that are sold on that link.
nice- they have a price break at 4 and i need 4.
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Old 09-13-2014, 02:12 PM   #13
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[QUOTE=Fe Man;25058052]
Quote:
Originally Posted by joeldemeritt View Post
took it out of the housing and tried the 9V trick on it. Nothing;
[/QUOTE]

The coil is dead then.
The DC voltage forces the speaker to go to its extreme in one polarity very quickly (hence the tock). It will not cycle due to it being DC and not AC.
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Old 09-13-2014, 09:50 PM   #14
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This is the perfect time to learn how to wind a voice coil by hand. It's one of the less popular fall activities, and entirely impractical from an economic standpoint, but guess who everyone will come to when their speakers blow during the coming zombie invasion.
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Old 09-14-2014, 04:24 PM   #15
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Quote:
Originally Posted by k-moe View Post
This is the perfect time to learn how to wind a voice coil by hand. It's one of the less popular fall activities, and entirely impractical from an economic standpoint, but guess who everyone will come to when their speakers blow during the coming zombie invasion.

Sounds tedious, youtube has some tutorials, any idea how much that wire goes for 36ish gage from what I saw?
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