John,
I don't know the answer to your question, but when I queried JBL about working on the 2441, they told me that they demag it before they work on it and implied that it easily came apart once the demag was done. I doubt you can completely demagnetize one without a very powerful electromagnet.
Widget
Man, if I was on that thing, I'd be barfing......Originally Posted by scott fitlin
I believe you are looking for the Hellfire club! They do spankings! We do woofing!
I use (4) grade **8** 1/4-40 bolts that are tapered to a small flat surface in each of the horn mounting holes.
Tighten each one down and then do a 1/8 ( or so ) turn on them one at a time and the top plate will lift off. Be sure to WD-40 the holes first in case you have to remove a snapped off bolt.
If you use a bit of acetone down in the throat bottom it will soften the glue that holds the bakelite throat in place - this should prevent the screen from being deformed.
Then use a succesion of wooden dowels to keep the parts apart until you can remove it by hand. Some of the later models used glue to hold the alignment ring in place and this sometimes is a super-tight fit to the phaseplug.
BTW - watch the fingers on this...it will hurt.
....then, carefully put all the parts into a sturdy box, get an RMA number from JBL, and send it in for the pro's to work on...
Sorry, I didn't mean to upset you. Good luck on your project. Please keep us all posted on how it goes. If possible, post pictures of your progress.
Regards,
Charley
Parts are only fixed by the magnet ?? Is it ? So i have to be very carefull with my old 2441 !
Eckhard
If they are dropped they are usually damaged by the magnet shifting and the throat cracking. Anyone interested in buying a 375, 376, 2440, 2441 etc. must look out for cracked throats. Many people do not realize that inside this 20+ lbs cast metal driver is a delicate plastic throat.
Widget
Hi Subwoof So once the top plate lifts away from the casting ,does the casting just pull away??? Or is there still alot of magnetic pull to contend with???
Hi John,
It seems very interesting to break a JBL 2440 down to the parts.
I want to see PICS~~~~
Here are the parts that make up the 2440.
By the way I would have never believed how much magnetic pull these drivers have before they are demagnetized, but I am a believer now!!!
Wow I always wanted to see what that phase plug looked from both sides. Any luck in finding a TAD 4001 to take apart for compaireison.
Vlad
Why doe,s that top plate look like it has a double layer with a spacing. Whats that spacing for?
Vlad
Where is the throat?
Widget
The Throats were history, that is why I got the pair for $20.00!!! They were cracked and are in many pieces now. Will have to get a pair.
Hi!
How do You tell if a throat is broken?
Regards: Jakob
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