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Fixing a misaligned speaker cone- help!

Discussion in 'Electronic Repair' started by Jacobe Hazzard, Aug 29, 2003.

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  1. 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
     
  2. 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!
     
  3. 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
     
  4. Jerry G.

    Jerry G. Guest

    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
    ==============================================
    message
    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
     
  5. 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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