Strange rattling noise from woofer |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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I've experienced quite a few situations across - all pass bands - where the thermal rise has been sufficient enough for glue failure, but not coil failure. |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Yes - a few years ago a friend had a load of JBL 18's fail after 1 or 2 gigs (VRX system). It was put down to some "bad" adhesive on the coils... |
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Earplugs Are For Wimps!
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Jo bg
Young Croc Joined: 08 March 2017 Status: Offline Points: 552 |
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Thanks to everyone who replied, I only got time to reach the warehouse yesterday to check them again.
Suspension is ok, spider looks still glued on both inner and outer side. Actually tapping the cone there could be a little hi pitched noise, but so faint I can't say for sure if it's in the speaker or in my head. Again I am sure I have been punishing these babies with hi levels and low hipass for years, so could be thermal glue failure as Toasty suggests? I doubt I have been bottoming them, but could have slowly cooked them, this happened to the first two subs we built, the second pair that came later is still working fine, so could be a damage that happened over time and not on a single abuse - or different batches of speakers with different glue? So these are going for a recone soon, I'll try and post some autopsy pics maybe we can understand what happened. Thanks again for your help! |
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Jo bg
Young Croc Joined: 08 March 2017 Status: Offline Points: 552 |
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Hi
So by pulling the cone totally outward you could feel some friction, in fact once opened they were loose and burned at the end. So I bottomed them . Allready working on the solution, more boxes coming. Thanks again for your collaboration!
Edited by Jo bg - 09 August 2021 at 4:13pm |
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