Subwoofer bangs and thumps

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Old 06-22-18, 09:16 AM
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Subwoofer bangs and thumps

Inherited a Polk PSW125 sub, sounds fine at volume 5 and below, but if I turn it up sounds like it is being hit with a 2x4. Any ideas? and is this worth repairing??
 
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Old 06-22-18, 10:14 AM
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Chances are if you pull the grill off you will find that the foam that attaches the cone to the frame is rotted.

They can be repaired for the cost of the foam and it takes a little time to clean all the old foam and adhesive off the parts so the new foam can be glued in.

I've repaired a couple sets of good speakers so the $15 for the pair was acceptable.
 
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Old 06-22-18, 11:56 AM
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OK, will pull the grill and have a look. Wasn't planning on repairing myself but if that is the issue I can probably handle it.
 
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Old 06-23-18, 11:29 PM
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I found this replacement woofer.... https://www.ebay.ca/itm/253572622200?ul_noapp=true

Do you think this would be ok for a 300W Polk sub?
 
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Old 06-24-18, 11:07 AM
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Did you check the Polk one yet ? Is it damaged ?
The speaker you linked to will work.
 
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Old 06-24-18, 02:14 PM
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Looked fine from the front. any other possible causes? I can push on the front and it bounces fine, don't see any cracks and appear to be in great shape.
 
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Old 06-24-18, 03:10 PM
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It could just be the lighting, but I see some suspicious areas in your photo. If there are tears in the speaker cone in those areas, that could explain the distortion you're hearing.
 
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Old 06-24-18, 07:29 PM
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that little bit can make it sound like a 2x4 hitting it?
 
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Old 06-25-18, 06:18 AM
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Are there tears in the cone material? That area supports the speaker cone and if it's torn, the support isn't consistent around the cone. If you have some RTV, you can "patch" the cone and see if that solves the problem.
 
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Old 06-25-18, 07:05 AM
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Watch the speaker as it's operating. Does it look like the speaker is s moving excessively ?
A weak foam surround will allow the speaker cone to bottom out in the magnet plate.
 
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Old 06-27-18, 08:37 AM
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Great advice, will try when I get back in town.
 
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Old 07-16-18, 09:47 AM
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Just as an addendum... Polk ended up sending me a replacement woofer for free...

Thanks for all the advice though.
 
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