1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  
    TalkBass.com has been uniting the low end since 1998.  Join us! :)

Mark Bass Blowing Speakers? Help!

Discussion in 'Amps and Cabs [BG]' started by Grantini, Dec 11, 2013.

  1. Grantini


    Jul 30, 2010
    I have a Little Mark III playing through a 102P and a 151P.... always worked seamlessly. Still under warranty.... All of a sudden, two nights ago, all three speakers blew. There was no discernable spike in volume or power. No pedals, no nothing, everything Mark Bass in the line and I was playing a Lakland bass with passive pickups. I have no idea what the heck happened.

    Has anyone else ever experienced this? I'm expecting the worst from VST on this... fingers crossed.
  2. silky smoove

    silky smoove

    May 19, 2004
    Seattle, WA
    Obvious question: Were you pushing the cabs too hard, either with volume or an over abundance of low end?
  3. If all three speakers blew at the same time that smells like a failure in the amp head. I personally would NOT try that amp with another cab until it is checked out. Three speakers at once is VERY odd.
  4. DWBass

    DWBass The Funkfather

  5. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada

    If the amp is under warranty contact MarkBass and get them to fix your system.

    Edit: I assume that both cabinets are 8Ω right??
  6. will33


    May 22, 2006

    The amp must've sent a big shot of DC through or something to blow them all at once, or some other catastrophic power section failure.

    Use the warranty claim and don't use it with any more speakers, though it may be ok to check the preamp out into something else to verify what failed.
  7. Grantini


    Jul 30, 2010
    Wasn't pushing it at all, rehearsing in the studio.... I agree it had to be a shot of DC... tech buddy coming over to check with a meter. I've filed the warranty paperwork and I'm getting ready for the worst.... Hopefully they will recognize that this was a purely markbass problem.... I've bought a lot of gear from them and gotten other friends to buy their stuff as well.
  8. Grantini


    Jul 30, 2010
    I do recall getting a whiff of something electric, but didn't think anything about it... tons of tube amps in our studio so you get that sometime.... that was most likely the voice coils cooking off
  9. will33


    May 22, 2006
    Have you tested your speakers with a battery or another amp to be sure they're all blown?

    All of them dying at once is pretty rare. It is possible just the amp crapped out. By your description, I don't think you were running hard enough to burn all the coils.
  10. Grantini


    Jul 30, 2010
    Ok, wait until you hear this.... we tested the head, absolutely fine... try again and at that point, we realize that the spring holding the pickup cover on one of the humbuckers on the lakland.... the pickup cover was vibrating against the flatwound making an ungodly noise.... because it was tied to the E string, it seemed to get worse the lower the note, which fit into the blown speaker scenario. Bottom line, I'm going to get the neck adjusted and the pickup cover fixed on the Lakland, in the mean time I'll play my stingray and the mark bass is FINE!!!!!!!!!!
  11. Ya hoo Good news!
  12. will33


    May 22, 2006

  13. Rosebud


    Jan 3, 2007
    Sigh of relief... I have been down the DC into the speakers road suck's.
  14. DirkP


    Jan 18, 2013
    Hamburg, Germany
    I would have been surprised, if the Little Mark (or any other modern amp) would have blown your speakers.

    The Little Marks have a built in limiter that prevents too hot signals from being sent to the speakers. And I would at least estimate that they have a kind of fuse that prevents dc from being sent to the speakers. My 80's Technics middle class hifi-amp had those fuses (on the outside, so that they could be replaced easily). I guess there is an equivalent of fuses in modern amps that shuts them down in those cases, so you don't even have to change a fuse.
    Am I right?
  15. No protection circuit even if present is a 100% guarantee. ;)
  16. P Town

    P Town

    Dec 7, 2011
    Yes. Sometimes an output device blows to protect the fuse.
  17. leroy diamond

    leroy diamond

    Aug 21, 2005
    Those dirty little laklands:D
  18. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    I had three Carvin FET series amps. A pair of 400s and a 900. The output of all three had a triac "crowbar" as protection. The idea was to cause the fuse to blow. Unfortunately the crowbar was on the amp side of the fuse and not on the output jacks side. :(