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Jbl l96 - refoam/recap? Repair dent? Other things to check?

Erik318

New Member
Hi!

First time poster here, although I've been lurking here silently for a while :) I have a few (perhaps stupid) questions, thankful for help.

I've just bought myself a pair of Jbl l96 speakers on ebay. I managed to get them for a fair price, and they seem to be in pretty good condition as far as I can tell.
Unfortunately one of the speakers was dropped during shipping, and one of the rear corners on the cabinet was dented (see picture). It is not a large dent, hardly noticable unless you look up close, so I don't really mind it too much. But is there anything simple I can do to fix it up slightly? or at least prevent the dent from developibg further?



Also, since one of the speakers was dropped I'm also worried if anything else could have been broken internally. I've hooked them up to my Technics SU-8600 amp and played them briefly on low/mid volume to check (I didn't want to play them for long since they need a refoam first).
They both seem to work just fine. Sound is coming from tweeters, mids and woofers. So that's a relief :)

Although I noticed two things:
* when pushing my ear up close to the mids/tweeters to check that they are working, the mids appear much quieter than the tweeters by comparison. At first I thought they didn't produce sound at all, but when I adjust the volume of the tweeter all the way down I hear that they are indeed producing sound - only it's hard to tell while the tweeter is playing since the tweeter appears much louder. Does this seem normal to you? Perhaps the crossover needs recapping, but both speakers are the same way, so that makes me think it's maybe just the way they are supposed to be? Overall I found the sound of the speakers to be pretty bright. For my taste I adjusted the tweeters to -3 to get a better balance and that helped, but maybe this is the design?
* Also, on one of the woofers I can see that where the little lead wires are visible on the cone (the ones covered in black glue next to the dustcap, see picture). The glue seems to have melted somewhat into a brown color rather than black. Is this somethings to worry about? I hope it's not a sign that something has burnt inside the woofer..

Next up, I have ordered a refoam kit from rick cobb. Hopefully I will manage the job myself without damaging anything, fingers crossed..

Thank you for your help! Please see attached pictures

/ Erik
 

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Once you refoam the surrounds, move them apart a liitle more and enjoy them. I'll bet they're great!
 
Lovely! They shouldn't need recapping; their crossovers have all film caps. I'd clean the L-pads, though. Everything else sounds fine. If you pull the woofers for refoaming you can clean the L-pads from inside and look for anything loose in there. I bet you won't find anything, but make sure the rear panel for the speaker terminals is secure.

I'd probably work on that dent very carefully with a hot steam iron and a piece of cotton; try to get it a little moist (not wet) and flatten out the sides. Maybe use a dental pick to manipulate it and pick out any loose pieces. Add a little wood glue inside it to stabilize it. (Just some ideas; others may think of better ones.)
 
Last edited:
Thank you!

Those are some great ideas! :) Could you elaborate a little more on how you would clean the l-pads? What would you use for this, deoxit d5 or something else? Also, can you manage to spray without removing them from the cabinet? I'm thinking that would probably only end up soaking the inside of the speaker?
(I've used deoxit only once before and thought the spray was rather hard to control. It seemed to spray way to much all over the place, so I'm afraid it will just leak all over and make a mess inside the cab..)

Eagerly awaiting the refoam kit now :)

/ erik
 
Lovely! They shouldn't need recapping; their crossovers have all film caps. I'd clean the L-pads, though. Everything else sounds fine. If you pull the woofers for refoaming you can clean the L-pads from inside and look for anything loose in there. I bet you won't find anything, but make sure the rear panel for the speaker terminals is secure.

I'd probably work on that dent very carefully with a hot steam iron and a piece of cotton; try to get it a little moist (not wet) and flatten out the sides. Maybe use a dental pick to manipulate it and pick out any loose pieces. Add a little wood glue inside it to stabilize it. (Just some ideas; others may think of better ones.)
I have a set of L46's from same era that are lytic with film bypasses. To the OP: I would snap a pic when the drivers are out and post.
 
I found some images in teh Google that suggest they are films.

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From inside the woofer hole, you could use the spray wand on some Deoxit (not sure which exact one is best) to get into the L pad vents, visible below. Maybe use a mirror and flashlight to help. Work the knobs a lot. If you're really ambitious you can easily pry off the covers (thin metal flaps hold them on) and spray the wiper assemblies, shown farther below, then bend the covers back on with your fingers.

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IMG_5394b.jpg
 
I'll be sure to post some pictures of the crossovers once I get the woofers out for refoaming. Still waiting for the refoam kit :)

Zonker92: thank for the tip! I'll try to do that if simply working the l-pad knobs back and forth a few times doesn't help. Would you use Deoxit D5 for this? Or F5?
 
I hope it helps; it usually does. Sorry, but I don't have expertise in which spray is better for L pads.
 
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