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Chris140's picture
Submitted By: Chris140
member
Joined: Dec 13 2012
Posts:
Voice coil rub on JBL LX44's. Can I fix it with a refoam?
Posted: December 15, 2012 - 7:49pm

I just got my JBL LX44's hooked up and ran them and they sound good except one problem, the foam deteriorated and there is a slapping sound when turned up. After some research I think it is the voice coil hitting the magnet and have stopped using them for now. I am just wondering if I was to buy a refoam kit and get it refoamed, would it fix the issue?

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jackfish's picture
Submitted By: jackfish
senior member
Location: Western Wisconsin
Joined: Dec 19 2005
Posts:
#1
Yes,
Posted: December 16, 2012 - 3:50pm

a refoam will keep the voice coil within appropriate tolerances.

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jgossman's picture
Submitted By: jgossman
member
Location: Louisville, KY
Joined: Aug 18 2011
Posts:
#2
Maybe
Posted: December 17, 2012 - 6:07am

If it's hitting it may help. If there's a buzz at a certain resonance, that's a rub.  It's a warped coil from overheating.  Usually from underdriving a less sensitive driver.  As soon as I have the cash I'm sending all 4 of the woofers on my B&W's to Miller sound.   2 are bad and 1 is suspect.  Miller is recommended by both B&W America and most people I talked to.  They are fairly cheap and really fast.

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commsysman's picture
Submitted By: commsysman
senior member
Location: SOUTHERN CALIFORNIA
Joined: Apr 4 2006
Posts:
#3
SPEAKERS
Posted: December 17, 2012 - 4:13pm

Once the voice coil has scraped, it is almost always irreparably damaged.

I strongly advise you to get a whole new driver from JBL If it is no longer available, they can probably supply a suitable replacement, but if that is the case you will have to replace the same thing on both speakers to have matching performance. Talk to a JBL engineer about it.

 

Chris140 wrote:

I just got my JBL LX44's hooked up and ran them and they sound good except one problem, the foam deteriorated and there is a slapping sound when turned up. After some research I think it is the voice coil hitting the magnet and have stopped using them for now. I am just wondering if I was to buy a refoam kit and get it refoamed, would it fix the issue?

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