• Please note that Audiokarma will be offline briefly for updates early on Monday morning, September 28th.

JBL L80T Project -- Gone Wrong

Hmmm, thanks DT; I'll have to eyeball that to see what you mean, but I think I get it.

If I have to go that far, maybe I can avoid cutting the tinsel leads, but if I do have to cut them, do you have any suggestions as to how and where?

Nice to have some plan of action; thanks again.
 
Thanks, DC! :D

You know me; I'll be sure to post pictures and an update, especially if I pull this off somehow. <fingers crossed>
 
May the force be with ya Zonk- it ain't nothin' but a chicken wing on a string thing.....or so my 9 year ole grand duaghter tells me!
DC
 
Thanks, Bent!! Somehow I missed that. I'm in Fresno. I wonder if there's a way I could use it.
 
I'm in Tracy. Here's what it looks like:

JBL127H.jpg
 
OK; thanks. The only thing I could think of, is maybe if my voice coil is toast I could use your cone. Thanks for the offer. I'll let you know how it goes and if I can use yours. I greatly appreciate it!
 
During a re-cone gone wrong I had success in removing a spider from a 10" cast basket. One of my exacto knife kits came with a chisel type blade that was only about 1/4" wide. I managed to lift an edge of the spider with a regular small cutting blade then wedged the chisel blade under the edge of the spider and worked it around the entire basket freeing up the spider. After my repair I used shims to center the VC and glued the spider back down with some adhesive from Simply Speakers. After completing the re-foam I was back in business. It takes time but it can be done. Good luck!
 
Cool; thanks! I have that same chisel blade, although by now it's dull; I should restock my Xacto blades. I can picture exactly what you say. Did you need to detach the tinsel leads?
 
Zonker92 said:
Cool; thanks! I have that same chisel blade, although by now it's dull; I should restock my Xacto blades. I can picture exactly what you say. Did you need to detach the tinsel leads?
Click to expand...

Yes, I had to unsolder the tinsel leads to make it all the way around. Took me over an hour to get around a 10" basket. It was slow going and I went through three blades but it was worth the effort.
 
Yep, I did the same thing to a Vifa 8" from a pair of Snells because the tinsel had to be re-soldered to the voice coil. I just cut around the outside of the spider to remove the voice coil before I refoamed them. The spider went right back in place like a lid goes in the jack-o-lantern. Bonded the edges back together. Saved the driver. Just like DC270.
In another case I was able to get apart of the spider lifted off the basket and then I could pry the spider off. There was some tearing but I had it in tact enough to glue it back in later.
No experience of that kind with a 127H. Good Luck Zonker
 
Yep, may as well giver a try!! I would try to pry up the spider as well, and while I was doing it, I would also be looking for a spare woofer just in case!!:yes:

Never hurts to have a spare.:no:
 
I think I KNOW!

I've been there before... On those drivers, Jbl used a thin foam screen over the pole piece that disintegrates and often gets caught in the V. coil gap and turns into a sticky gap-clogging mess. how I fixed this is i carefully worked the cone back and forth-- there was resistance, but kind of a soft rubbing feeling. I also played the woofer around its FS and it eventually stopped rubbing- the gum had settled out of the operating range. nonlinear motions had a sticky actions, while the gum was in the gap, a particular kind of distortion was very audible. If you drip a SMALL ammount of denatured alcohol (flammable) into the gap while working the cone, it may loosen up that gummy yuk.

Don't worry. You got this.
 
teebee said:
I've been there before... On those drivers, Jbl used a thin foam screen over the pole piece that disintegrates and often gets caught in the V. coil gap and turns into a sticky gap-clogging mess. how I fixed this is i carefully worked the cone back and forth-- there was resistance, but kind of a soft rubbing feeling. I also played the woofer around its FS and it eventually stopped rubbing- the gum had settled out of the operating range. nonlinear motions had a sticky actions, while the gum was in the gap, a particular kind of distortion was very audible. If you drip a SMALL ammount of denatured alcohol (flammable) into the gap while working the cone, it may loosen up that gummy yuk.

Don't worry. You got this.
Click to expand...

Yup!! +1 on that as well!! It is a mess.
 
Dang; that's huge, and makes total sense; the sound in there is like what happens when you rub the edge of something against some plastic foam. I'll remove the dust cap and give it a try. Thanks!
 
Last edited:
Zonker92 said:
Dang; that's huge, and makes total sense; the sound in there is like what happens when you rub the edge of something against some plastic foam. I'll remove the dust cap and give it a try. Thanks!
Click to expand...

Leave a flap on the dust cap so it will drop back into the exact original location.
A bit of glue used for re-foams (dries clear) and you'll never be able to tell you were in there. The JBL dust caps can be a bitch to cut into as they're usually fairly thick.
 
Thanks. These are larger, aftermarket dust caps from Orange County Speaker Repair. Freshly glued on and very well attached. Darn it.
 
OK, I'm all done, except for some grill cloths. Thanks to brainsmasher, I have some minty refoamed woofers and all is well in the world; they sound great. Not the bottom end of the L250/Tis, but otherwise terrific, smooth, excellent imaging, clarity, soundstage. Good stuff.

brainsmasher is the man!

DSC_3098.jpg
 
You must log in or register to reply here.
Back
Top Bottom