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Old 24th August 2006, 10:15 PM   #1
Mayank is offline Mayank  United States
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Question Advice on DIY voice coil replacement

I have a 15" 1000W subwoofer driver with a perfect rubber surround, cone diaphragm, duct cap and a *very* heavy and large magnet. Unfortunately, this has a burnt voice coil (zero ohms across the terminals and a lot of friction when tried to be gently pushed in/out).

Now, I have replaced surrounds on several speakers - but am yet to get into the big league and try replacing a voice coil

Can this be done as a DIY? Has anyone done this sucessfully and could offer me advice? I could only locate MAT Electronics as a source for replacement voice coils.

Thanks
Mayank
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Old 24th August 2006, 10:30 PM   #2
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This Shop was recommended to me by an owner of an electroncs shop. I called him to re do my 39 year old RTR HPR Magnium 12's.

Perhaps you can find a member in your area, and call for assistance.

The Main site to find help is

http://www.recone.com/reconers.htm


Tri-State
Loud Speaker

650 Franklin Ave
Aliq PA 15001
if our email doesn't work, please call !

724-375-9203

http://recone.com/reconersdirectory/pennsylvania.htm
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Old 26th August 2006, 12:19 AM   #3
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Hi Mayank,

I would contact the manufacturer for a recone kit. If that's not available you might want to look for an aftermarket cone but you will need someone with enough knowledge to get you a decent replacement.

If there is significant damage inside, around the magnet and pole piece, then sometimes it's just too tough to clean out the nasties and you'll have to start with a new driver.

Yes you can do a recone yourself but I recommend you watch someone do it first.
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Old 26th August 2006, 01:34 PM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
I have a similar problem.

I think the driver must have been dropped and the magnet became detached and squashed the VC and former.

I became disillusioned at the prices retailers were charging for re-cone kits, VC & formers, leadout wires.

It seemed to be uneconomic to save my 18inch driver, but I'm still living in hope.

Awaiting responses from others.
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Old 26th August 2006, 06:59 PM   #5
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Default Recone 12"

I can get a 12" mid rebuilt for $55.00 us, plus shipping new

spider, VC, cone, cap and tested.

what costs are you encountering?
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Old 26th August 2006, 10:11 PM   #6
unmibh is offline unmibh  Bosnia and Herzegovina
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Hi Mayank, Andrew T,

"Can this be done as a DIY? Has anyone done this sucessfully and could offer me advice? I could only locate MAT Electronics as a source for replacement voice coils. "

If you can source the voice coil that would match your burn one, so much the better.

I have seen someone did it and I knew after that I could do better and so I did try on some speaker that are destined to the dust bin.
Remove the old coil by cutting through the dust cap,cone and spider, you will need to cut it with a sharp blade with great care as you need them as close as possible as you need them to glue back to the new voice coil former.
Place the new coil in place of the old one. place some sim between the pole piece and the voice coil former, I use some strip of bond paper on four side to hold the coil in the center of the pole piece, once centered and firmly in place glue the former to the spider and the cone, when dry remove the sim and check that the cone is free of any rubbing on the pole piece and the yoke by pushing the cone in and out, measure the coil for resistance, if not use a 1.5V penlight battery to check the speaker if you hear / see the cone move, then place back the dust cup, you just revive a dead speaker.

I hope that help.

This is DIY so do this is on your own risk.

This is assuming that the yoke and the pole piece is clean and free of any debris. If your ambitious you can wind the coil yourself
I did it once as a practice run and it work. After this I did a couple or reconing while reuse the original voice coil on a kapton former using the same process mention above.

cheers
unmibh
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Old 27th August 2006, 09:37 AM   #7
AndrewT is offline AndrewT  Scotland
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Hi unmibh,
what glue did you use to attach the Kapton to the spider/cone?
What glue for the VC to Kapton former?

How much more difficult is it to do 4layer rather than 2layer?
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Old 27th August 2006, 05:16 PM   #8
unmibh is offline unmibh  Bosnia and Herzegovina
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Hi Andrew,

I use what ever glue is available to me at that time which is Elmers Glue, and some rubber cement. I use elmers Glue to hold the voice coil in place and this may not be the best to use but it did hold, later on I was told by a friend of mine that using epoxy ( the one where you mixed two part ) was better that it will also hold on at higher temp, all you need was to wipe a thin coat on the coil to hold them together.
Insulating varnish that is used on transformer will work too if you have them.
For the spyder and cone I use rubber cement and for the dust cap elmers glue since they will turn clear when dry and will retain the clean look.
I only did a two layer as making 4 layer wont do as the gap between the pole piece and yoke is small. I use wire from old transformer, since that was just a trial run, It all work out OK for me.
I think speaker glue are now readily available.

Practice first is what I could advice. Its really quite easy and can be done.

Good luck and I hope this help.

Cheers
unmibh
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Old 29th August 2006, 02:09 AM   #9
Mayank is offline Mayank  United States
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Default I am motivated to attempt this!

Here is what I have done/found out so far:

[ppcblaster] Thanks for referring the reconer repair shop listings. I called a few of them (they were all extremely courteous) and got quotes between $105-$160 to replace the voice coils for this speaker. In addition, shipping charges for this 28 lb speaker (both ways) would add another $80-$100.

[cal] I contacted the "manufacturer" (Definitive Technology); they do not stock or sell recone kits but offered to send me a replacement driver. I think this could be because they are using speakers from an OEM supplier. I could not identify the original manufacturer from the label which is as under:

0676A100 151569 75 OHM
67-98380033 G3

I am trying to locate aftermarket voice coils and spiders (only one I found who will sell 1 or 2 pieces is MAT Electronics). There doesn't seem to be any damage inside around the magnet - but I will confirm that once I remove the cone.

[unmibh] I hope the replacement voice coil will work. Thanks for your instructions (I believe these are the *only* ones found anywhere! Question - did you cut through the dust cap, cone and spider while the cone and surround was attached to the frame or did you seperate the cone first? I hope it is the former.

[andrewt] I found a page on an adhesive manufacturer's website with details of different types of glues for spiders and cones. Good ponters on the process as well, including that for kapton:

http://www.hernonmfg.com/speakerass.htm

I am off to attempt to do this next weekend. Wish me luck
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Old 30th August 2006, 06:20 PM   #10
unmibh is offline unmibh  Bosnia and Herzegovina
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Hi Mayank,


http://www.decware.com/newsite/refoam.htm


I found these on another forum and this is exactly what I did before.

Good luck and Have fun.


cheers
unmibh
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