Gig tonight- need help- 4 ohm head- 2x 4 ohm cabs

Discussion in 'Amps and Cabs [BG]' started by Thejamesjordan, Jun 21, 2019.

  1. Thejamesjordan


    Mar 2, 2006
    hey guys,

    Sorry for the urgent request. I have a gig in about 2 hours.

    On a scale of 1 to 10 how bad is it to run a 4 ohm head (GK 700 rb) to 2x 4 ohm cabs? I know it splits ohm and it is not ideal- but will I blow something up?

    Unfortunately it is a strange set of circumstances leadin to this. Can’t use PA for bass :/

  2. Munjibunga

    Munjibunga Retired Member

    May 6, 2000
    San Diego (when not at Groom Lake)
    Independent Contractor to Bass San Diego
    Yes, it will blow up. [/thread]
    blindrabbit, whero, MCF and 9 others like this.
  3. charlie monroe

    charlie monroe Gold Supporting Member

    Feb 14, 2011
    Buffalo, NY
    Can you get a series speaker cable in the time you have remaining?
  4. Inara

    Inara Fierce Fun Fretless Female

    Jun 12, 2017
    Seattle, WA USA
    You need to just pick one of the cabs. You may damage the head, or it may go into protection mode and go silent while you're playing. One of those two things will be the most likely result.
    MCF, ArtechnikA, Aqualung60 and 2 others like this.
  5. Run one cab. If you run both it will cause issues and possibly blow the amp and cabs.

    Can’t stress this enough.
    blindrabbit, MCF, Aqualung60 and 2 others like this.
  6. Killed_by_Death

    Killed_by_Death Snaggletooth Inactive

    IF you know what you're doing you can make a series speaker cable.
    Jscriv, Quinn Roberts and Wisebass like this.
  7. abarson


    Nov 6, 2003
    Santa Cruz
    The back of the 700 RB states:
    "One or two 8 ohm cabinets
    or one 4 ohm cabinet"

    Heed what Gallien-Krueger wrote on the amp or you will likely damage something and screw your gig.
  8. Thejamesjordan


    Mar 2, 2006
    Thanks guys. I regrettably know you’re right haha.

    Same issue if I daisy chain them right?
  9. bherman

    bherman Gold Supporting Member

    Apr 30, 2009
    Grand Junction, CO
    blindrabbit, MCF and Aqualung60 like this.
  10. Stumbo

    Stumbo Guest

    Feb 11, 2008
    Yes. Unless it's a serial cable.

    You can stack the cabs, plug in the top one. It'l look killer and sound good 'cause the top cab will be firing at your ears.

    Good luck with the gig!
  11. john m

    john m Supporting Member

    Jan 15, 2006
    I’d bet 20:1 that the output stage of the amp will cook if it doesn’t go into thermal protection mode first.
  12. five7

    five7 Supporting Member

    Dec 5, 2009
    what are the two cabs
    kbakerde likes this.
  13. Munjibunga

    Munjibunga Retired Member

    May 6, 2000
    San Diego (when not at Groom Lake)
    Independent Contractor to Bass San Diego
    If you mean running a cable from one cab to the other, it's identical to running the cabs from two outputs on the amp - they're still in parallel.
  14. Clark W

    Clark W Just Say No To Tort! Supporting Member

    Aug 26, 2018
    So how did the gig turn out? What solution did you use?
    Personally I liked the stack the two cabs and only plug the top one in for tonight.
    When you have time to sit down and actually make or buy one, a serial cable or serial box will do what you want.
    For future reference:
    What is the best way to connect speakers or cabinets?
  15. Amp most likely thermals- Shute off to protect itself. Minutes of silence ensue.
  16. Thumpin6string

    Thumpin6string Supporting Member

    Apr 25, 2013
    Shoals Indiana
    If you like magic smoke, go for it.
    cableguy likes this.
  17. Ric5

    Ric5 Inactive

    Jan 29, 2008
    I like 5, 8, 10, and 12 string basses
    Running one 4x10 is a good choice

    If you run 2 cabs in serial then the load becomes 8 ohms and that reduces the power

    You best bet is 2 heads … each running one cab
  18. This. If you borrow a buddy's amp or even a PA amp and run the effects send from yours into it.
  19. Raf Seibert

    Raf Seibert

    Dec 16, 2013
    If you think you might have your cabs wired in series, there’s an easy way to tell - unplug one cab. If they’re wired in series, both cabs will stop making sound. If the one still plugged in continues to play, they’re wired in parallel. Needless to say, this experiment should be done at low volume.
  20. JimChjones


    Aug 6, 2017
    SE England
    Personally I'd strongly advise against series cables. It's the sort of 'clever' solution that can easily go horribly wrong. If I needed to do this regularly, then, assuming these are 4x cabs, I'd rewire them internally to be 16ohm.