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PA speaker repair

Discussion in 'Electronic Repair' started by ChChChad, Jan 5, 2008.

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  1. ChChChad

    ChChChad Guest

    I have a Kustom PA speaker that can handle up to 80 watts. A 120 Wat
    guitar head was plugged into it and now all that comes out of it is
    faint crackled signal. I can tell what I'm playing when I play troug
    it but it is just very quiet and distorted. What have I blown and ho
    can I fix it if it even can be fixed
     
  2. jakdedert

    jakdedert Guest

    Time to shut off the amp and plug another speaker in. Hopefully 'all'
    you've blown is that Kustom. Keep playing and you'll likely blow the
    amp as well.

    jak
     
  3. What's that?
     
  4. Arfa Daily

    Arfa Daily Guest

    A 120 watt head dimensioned for lead guitar ? That's what I tend to call
    them as well, Dave. As opposed to a 'combo' or 'slave' or 'bass head' ??

    As far as the OP's problem goes, it is likely that the voice coil has
    overheated and boiled the insulation on the wire making up that winding.
    This causes it to 'bubble up' and effectively increase its cross section,
    which in turn causes it to fill up the tiny air gap that it runs in, making
    it foul the magnet pole pieces and drag or totally seize, as it sounds like
    has happened in this case.

    Speakers can be re-coned by specialist repairers, but unless you are
    particularly 'in love' with the sound this specific speaker makes, you may
    as well just scrap and replace it. Replacement drivers for this market are
    surprisingly cheap, and you will almost certainly find that your local PA
    equipment store carries such replcements 'on the shelf'. I agree with jak
    that if you keep trying to use it, you are likely to fry the driving amp as
    well.

    Arfa
     
  5. Meat Plow

    Meat Plow Guest

    Replace the speaker.
     
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