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Broken magnet in vintage speaker

75.140.86.124
Posted on May 16, 2016 at 11:53:03
FenderLover

Anyone ever fix a speaker whose magnet spilt, due to extreme cold conditions? This Eminence speaker is owned by man in Alaska, that kept in in the garage over Winter. Cracked in half, when he tried to use it this Spring.

Thanks!

 

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RE: Broken magnet in vintage speaker, posted on May 16, 2016 at 12:57:33
Eli Duttman
Audiophile

Posts: 10455
Location: Monroe Township, NJ
Joined: March 31, 2000
 Perhaps a STRONG epoxy loaded with powdered iron/steel, like Devcon brand "Plastic Steel", will save the day.


Eli D.

 

RE: Broken magnet in vintage speaker, posted on May 16, 2016 at 13:01:16
Mr. Dick Hertz
 Try 2-part epoxy to glue it back together.Make sure the pole piece is clean and centered with the voice coil. Keep the epoxy off the voice coil. (It doesn't vibrate much if it's glued to the pole piece.) Might work, might not. What have you got to lose?

 

RE: Broken magnet in vintage speaker, posted on May 16, 2016 at 13:13:28
Alpha Al
Industry Professional

Posts: 2958
Location: N. Carolina
Joined: February 16, 2004
Contributor
  Since: December 3, 2015
 Some reconers have a machine to demagnetize the magnet and later recharge it. Without that, it is nearly impossible to maintain gap symmetry while the glue cures.

 

RE: Broken magnet in vintage speaker, posted on May 16, 2016 at 14:39:59
Coner
Audiophile

Posts: 3703
Location: S.W. Washington state, USA
Joined: November 17, 2001
 Chances of success at alignment are VERY slim, gap has to be
perfectly uniform....I'd toss it if it were mine.

 

RE: Broken magnet in vintage speaker, posted on May 16, 2016 at 15:01:34
satellite65
Audiophile

Posts: 484
Location: Illinois, NE
Joined: December 13, 2004
 I've done it successfully twice using multiple strips of cardboard to make a cone shaped guide for the pole piece. You need to remove cone, VC, and spider as an assembly first. I posted a guide in Audio karma but there site is presently down.

On mine the magnet had let loose at a glue joint and had not broken. I don't know if that makes a difference or not.

 

Yep, posted on May 16, 2016 at 19:02:48
manerac
Audiophile

Posts: 191
Location: Mpls
Joined: June 29, 2007
 JB Weld is probably as good as anything commercially available.

Do a dry fit check and scribe a few alignment marks with pencil. Apply a thin layer with a stiff brush. Cure in ~120F oven for highest strength.

 

RE: A centering jig is necessary and possible., posted on May 17, 2016 at 05:55:59
GRH
Audiophile

Posts: 444
Location: CT
Joined: March 22, 2004
 I have successfully done this a couple of times. Polk 6.5" drivers are notorious for this and for that size driver people have successfully made a jig out of large pvc pipe with three bolts (kind of like a xmas tree stand), search online. For a larger driver I was able to use three large (1ft)trigger style wood clamps to center the magnet/pole piece then use a healthy amount of epoxy all around the perimeter. It was tedious to get it centered and I would only recommend making the effort for special speakers.

 

Thanks, everyone! , posted on May 17, 2016 at 09:16:19
FenderLover
 Think the owner is mulling over his options. The DIY jig is an interesting idea.

8^)

 

RE: Broken magnet in vintage speaker, posted on May 17, 2016 at 10:59:59
satellite65
Audiophile

Posts: 484
Location: Illinois, NE
Joined: December 13, 2004
 Here is a link to how I fixed a few woofers

 

How cold, posted on May 17, 2016 at 20:17:35
Dingojazz
Audiophile

Posts: 1045
Location: Sonoran Desert
Joined: January 3, 2005
 Is too f'n cold!!

K

 

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