Fixing a misaligned speaker cone- help!

J

Jacobe Hazzard

Guest
I have a fairly valuable vintage goodmans woofer with a misaligned speaker
cone. The cone is tilted about 1/4" off its axis at the wide end of the cone
(I can e-mail pictures if interested). This causes the voice coil to rub and
prevents movement of the cone and proper operation of the driver. I believe
the damage was caused during shipping - the voice coil itself is still
intact with the correct resistance. The suspension and cone also appear
undamaged.

Is there a way to re-align the cone and fix this driver?

TIA
Adam Yudelman
 
"Jacobe Hazzard" <jacobe-hazzardR-E-M-O-V-E@eudoramail.com> wrote in message
news:3KM3b.95470$_V.94424@news04.bloor.is.net.cable.rogers.com...
I have a fairly valuable vintage goodmans woofer with a misaligned speaker
cone. The cone is tilted about 1/4" off its axis at the wide end of the
cone
(I can e-mail pictures if interested). This causes the voice coil to rub
and
prevents movement of the cone and proper operation of the driver. I
believe
the damage was caused during shipping - the voice coil itself is still
intact with the correct resistance. The suspension and cone also appear
undamaged.

Is there a way to re-align the cone and fix this driver?
Click to expand...
I'm not sure but have done this kind of work in the past. It can be tricky
because the geometry is tough to visualize. When you push on the cone, with
four equally spaced fingers (counting your thumb), can you feel the cone
rubbing? Can you lay a sheet of glass across the front of the speaker frame
and see the deviation from a flat plane? If the answer to both questions is
yes, then you might be able to bend the frame and eliminate the rub.
Honestly, this is difficult to do and can lead to additional damage. If you
are good with tools and have them you might pull it off. If the speaker
frame is die-cast, forget it!
 
Charles Schuler wrote:
Is there a way to re-align the cone and fix this driver?

I'm not sure but have done this kind of work in the past. It can be
tricky because the geometry is tough to visualize. When you push on
the cone, with four equally spaced fingers (counting your thumb), can
you feel the cone rubbing? Can you lay a sheet of glass across the
front of the speaker frame and see the deviation from a flat plane?
If the answer to both questions is yes, then you might be able to
bend the frame and eliminate the rub. Honestly, this is difficult to
do and can lead to additional damage. If you are good with tools and
have them you might pull it off. If the speaker frame is die-cast,
forget it!
Click to expand...
So what you are saying is that the cause of the damage is almost certainly a
bend in the frame, and the only way to fix it is to reverse the bend?

Thanks,

Adam
 
There are places that do speaker re-coning and rebuilding. Over here we
use Soundcraft for this type of work. They are excellent. There are a
number of companies in our area that do speaker re-coning.

Soundcraft is world wide. Contact them to find out about sending them
your speaker. To make them match and be in good condition, I would do
the two of them in a pair.
http://www.soundcraft.com/

--

Greetings,

Jerry Greenberg GLG Technologies GLG
==============================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
Instruments http://www.zoom-one.com/glgtech.htm
==============================================
"Jacobe Hazzard" <jacobe-hazzardR-E-M-O-V-E@eudoramail.com> wrote in
message
news:3KM3b.95470$_V.94424@news04.bloor.is.net.cable.rogers.com...
I have a fairly valuable vintage goodmans woofer with a misaligned
speaker
cone. The cone is tilted about 1/4" off its axis at the wide end of the
cone
(I can e-mail pictures if interested). This causes the voice coil to rub
and
prevents movement of the cone and proper operation of the driver. I
believe
the damage was caused during shipping - the voice coil itself is still
intact with the correct resistance. The suspension and cone also appear
undamaged.

Is there a way to re-align the cone and fix this driver?

TIA
Adam Yudelman
 
So what you are saying is that the cause of the damage is almost certainly
a
bend in the frame, and the only way to fix it is to reverse the bend?
Click to expand...
No, I was guessing since you mentioned that it might have happened during
shipping. Have you measured the diameter carefully? Is there a chance the
front of the speaker is slightly elliptical?
 
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