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Amp head causes speaker cones to jerk in and out

Discussion in 'Amps [BG]' started by don21480, Jan 31, 2014.

  1. don21480

    don21480 Supporting Member

    Joined:
    Mar 17, 2006
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    Very odd but my Markbass F1 head on a couple of recent occasions has made shorting type sounds thru the speakers of the connected cabinet and the speakers jerk in and out violently. It does this even with no instrument cable plugged in. I've been able to determine thru the process of elimination that its not the speaker cable or the cabinet so it must be originating in the head. I don't even know what to call this to send it to a repair center. Anybody got a clue what this might be.
  2. beans-on-toast

    beans-on-toast

    Joined:
    Aug 7, 2008
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    It sounds like you might have a high frequency oscillation in the amp. Best not to use the amp while it is doing this.
  3. NYCbassist

    NYCbassist Supporting Member

    Joined:
    Mar 10, 2007
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    Might start with some deoxit and clean all the cable connections. Maybe try reversing the ground lift.
  4. Stealth Fighter

    Stealth Fighter

    Joined:
    Apr 14, 2013
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    It could be something as simple as a broken/intermittent component lead. Whatever it is, it doesn't sound like it's doing your drivers any good. Better to see a tech now than later when more damage has been done.
  5. don21480

    don21480 Supporting Member

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    Mar 17, 2006
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    Nobody locally works on markbass so I'll have to send to one of their service centers - its the drawback to markbass for sure

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