Detached Pole Piece on JBL E140?
Hi.
I bought a pair of JBL E140s on eBay. those are the ones with the big ceramic magnets. They were "broken" so I knew I would need to recone them. However, on one of them the center pole piece is no longer attached. It was wedged against the coil so tightly that I had to pull up the voice coil on the opposite side, bump the frame to move the pole piece to the opposite side, pull up on the newly freed side, and repeat until the voice coil was completely free.
1) Can it be repaired?
2) If so, how?
Thanks!
tolerance pole and magnet.
Quote:
Originally Posted by Zilch
No bolts, just holes, though there's tapped holes in the front plate that would line up with them, looks like. Some studs could be mounted there to grab the magnet and hold it in alignnment, yes. I guess JBL found they didn't need any attachment other than the glue. It grabs the front plate pretty hard magnetically, as well, requiring a tool pounded between them to separate as I've shown.
Hello,
My comprehension on why JBL is only glued magnet is :
the magnet is fragile material. the best perfect conctact to magnet and metal pole piece, the better than. Normally the metal pole contain "tool for alignment magnet and ideall never affect the magnet field. the glue is arround of the join magnet and pole piece. any strong bold risk to distord the pole and fracture the magnet... (and the bold in mu-metal and strong power is very costly).
of course some time the magnet is badly gued and some time the 2 surfaces preparation is not good... more fragile, more distortion, and more risk to broken...
anyway this is a speaker not a bowling ball.
and if magnet is fractured or broken the driver is garbage... anyway probably the frame is distorded...
sorry...