magnetic shift insurance
zarrdoss
Posts: 2,562
I have a lot of time sitting around the house and being quiet so I decided to get some hefty adhesive and glue around all the magnets around the top plate and bottom on the magnet to prevent loosing a driver to magnetic shifting. I figured what the hell better than doing nothing.
Attachment not found.
Attachment not found.
I pulled out one driver at a time and glued it and then replaced it. The glue set up fast so no dripping, then left the last one out and put a small fan blowing inside to help dry faster and will put the last one in tomorrow when its all good and dry.
Take care.
Attachment not found.
Attachment not found.
I pulled out one driver at a time and glued it and then replaced it. The glue set up fast so no dripping, then left the last one out and put a small fan blowing inside to help dry faster and will put the last one in tomorrow when its all good and dry.
Take care.
Post edited by zarrdoss on
Comments
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What adhesive are you using?Stan
Main 2ch:
Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.
HT:
Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60
Other stuff:
Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601 -
Its called quick grip, seemed to work really well on the trial speaker. Anything that bonds to metal and ceramic should work. now only 24 more drivers to go!
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I have a lot of time sitting around the house and being quiet......now only 24 more drivers to go!
You aren't kidding! -
I've never seen or heard of a magnet seperating where you glued it. Usually, they seperate from the basket, and the peices you glued shift or fall off, still attached together.
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the basket is riveted on to the top plate, here this will help
http://www.polkaudio.com/forums/showthread.php?t=87460&highlight=magnet+shift -
the basket is riveted on to the top plate, here this will help
http://www.polkaudio.com/forums/showthread.php?t=87460&highlight=magnet+shift
Interesting. Here is the method I have seen used before, glad I didn't bother.
http://www.polkaudio.com/forums/showpost.php?p=936784&postcount=1
It made sense to me at first, the only magnet failure I have had was on a set of Rti-28's, and the magnet seperated from the basket. There were no rivets on that speaker. -
So, they are held on with rivets. How do you reinstall the assembly to the speaker basket?Vinyl, the final frontier...
Avantgarde horns, 300b tubes, thats the kinda crap I want... -
I have done some research and preliminary tooling to "re-center" the shifted pole plates and magnets on the MW65XX series of drivers. As far as I can tell so far.... the "base" plate is fastened to the basket by 4 rivets and ain't going anywhere anytime soon. Most often it is the pole (outermost) plate that shifts when the adhesive fails, sometimes the magnet itself detatches from the base, with the pole plate still centered on the magnet. To really insure that all pieces stay put I put a heavy bead of JB Weld on both sides of the magnet, right up against the two plates. Prior to applying the JB, I use a professional grease & wax remover from an auto body supply shop to get everything absolutely clean. I don't ever expect to have the drivers fail due to shifting after performing this procedure. Fingers crossed !!! Link to thread with pics of a MW6510 that was "disassembled" by a member which I have gratefully obtained from geoff727. I am still interested in acquiring more drivers with shifted poles/magnets if anyone has some that are destined for the landfill.:)
http://www.polkaudio.com/forums/showthread.php?t=87460 -
will dipping the magnets up to the bottom of the basket in some sort of plastic resin or that material used to make rubberized grips for tools work for this purpose?The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD
“When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson -
nooshinjohn wrote: »will dipping the magnets up to the bottom of the basket in some sort of plastic resin or that material used to make rubberized grips for tools work for this purpose?
I doubt the rubber grip material will have the same kind of HOLD that true addhesive will have, also the dip will give the entire magnet structure a blanket not sure that's a good idea...Polk Audio RTA 12c's, Monitor 7c, Monitor 5JR+, SDA CRS+ -
Guys most of the original MW were not riveted. I have had about 10 drivers damaged in shipping.
http://www.polkaudio.com/forums/showpost.php?p=654292&postcount=141
Nearly none of these were riveted.
Epoxy may work. I have used high heat hot glue.Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben -
You can easily tell if they are riveted, just shine a AA mag light into the spider in a darkened room and you will see the rivets through the spider