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Is this an overheated voice coil?

Discussion in 'Amps and Cabs [BG]' started by ficelles, May 16, 2018.

  1. ficelles

    ficelles Supporting Member

    Feb 28, 2010
    Devon, England
    Is this the sign of an overheated voice coil, or just some weird corrosion?

  2. rufus.K


    Oct 18, 2015
    wow. if that a Vifa ?
  3. tadawson


    Aug 24, 2005
    Lewisville, TX
    Looks like nothing more that a bit of corrosion on some manufacturing swarf to me . . . The vc isn't close enough to the backplate to transmit that much heat there if it tried . . .

    - Tim
  4. You should carefully clean that stuff off.
  5. ficelles

    ficelles Supporting Member

    Feb 28, 2010
    Devon, England
    Toxic? I wiped it off into the trash with a paper towel, came away as a powder.
  6. Truthfully I don’t know. My dad would have - he was a Metallurgical Chemist. I followed Electrical Engineering. :)
  7. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    It's likely zinc oxide, harmless corrosion unless it ends up in the gap due to storing the speaker in damp places.
    Tom Bomb, ficelles and Stumbo like this.

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