newbie questions about GK 700RB2

Discussion in 'Amps and Cabs [BG]' started by peter G, Jun 22, 2005.


  1. peter G

    peter G

    Sep 28, 2004
    ohio's northcoast
    Why does the GK 700 have 2 speaker outputs (per style) does it matter which I use for 8 ohm? And do I really have to use GK cabs to use the bi-amp tweeter control or will the four wire speakon work with other brand cabs with tweeter?

    Please forgive me if these questions sound stupid, I'm just a tech-challenged old guy who decided to buy more amp than he can handle in search of better tone thanks peter.
     
  2. it has two 1/4" speaker outs so you can hook up two, 8 ohm cabs to it. the speakon outs are for the bi-amp function (for the horn i believe). from what i have heard, you do need GK cabs to make use of the bi-amp mode.
     
  3. Fred312b

    Fred312b What if I want to play jazz precisely? Supporting Member

    Apr 23, 2002
    Chicago, IL
    it doesn't matter which jack you plug into with one 8 ohm cab, but don't use the 4 conductor speakon cables with non-gk cabs- that would be bad. you CAN use 2 conductor ones with the 700rb and non-gk cabs and be fine though... i'm sure daniel elliot will come by and give you technical answers soon...
     
  4. If you wanted to use the horn bi-amp feature, you would need to use a GK cabinet or modify your other cabinet. We included a pair of Speakon and a pair of 1/4" jacks so that if you want to run two 8 ohm cabinets, you have the option to use either/or.
     
  5. shaolinwhat

    shaolinwhat

    Jun 5, 2005
    Ohio
    i have been using the 700rbII with an ampeg 8x10, with the one speakon cable that comes with the amp, for about a year now with no problems.
     
  6. peter G

    peter G

    Sep 28, 2004
    ohio's northcoast
    Ok thanks folks, if you run an 8ohm out each 1/4” jack, is it still only 8 ohm? If I want to get down to 4ohm I could run two 8ohm cabs in series plugged into 1 jack?

    It seems 25 years ago when I quit playing bass my gear was simpler :) but I think I'll be happier with this head/cab over a combo once I figure it out thanks peter.
     
  7. if you plug in two, 8 ohm cabs into the 1/4" outs, it will be 4 ohms. you don't need to daisy-chain them
     
  8. mkrtu9

    mkrtu9

    Mar 2, 2006
    Tuscola
    Just bought a 700RBII head and an Ampeg SVT410HLF. I'm confused on how I connect the head to a 4ohm cab. I take what everyone has said about the 2 1/4" plugs as being 8ohms a piece. I also don't understand where the speakon cables come into play. Just very confused.:confused:
     
  9. Lowtonejoe

    Lowtonejoe Supporting Member

    Jul 3, 2004
    Richland, WA
    The lowest impedance a 700RBII will power safely is 4 ohms. That means that you can hook up ONE 4 ohm cab or two 8 ohm cabs safely.

    It does not matter if you use the 1/4" OR speakon outs.

    IF you use the speakon outs use only the +1,-1 configuration for your speaker (this is the standard). The +2,-2 is for the horm amp (the 700RBII has two non bridgeable amps, one for woofer (+1,-1), one for tweeter (+2,-2)).

    So, to hook up a single 4 ohm cab, use EITHER the speakon or 1/4" outputs. To hook up two 8 ohm cabs (for a total of 4 ohms) use ANY TWO of both kinds of outputs OR ONE output and daisy chain the two cabs together.

    (Remember, use the +1,-1 configuration for the speakons)

    :D

    Joe.
     
  10. mkrtu9

    mkrtu9

    Mar 2, 2006
    Tuscola
    so i can use one of the 1/4" outputs and put it into my 4 ohm cab and the head will push the 4ohm wattage? So if I want to plug it into my 2x10 8ohm cab how do i use both of the 1/4" plugs into the one jack in the cab to get the required 8ohms....i just wanna play, this tech stuff is a bit over my head...i should hire a roady!!
     
  11. Lowtonejoe

    Lowtonejoe Supporting Member

    Jul 3, 2004
    Richland, WA
    The ohms part refers to total speaker load.

    1 8ohm speaker cab = 8ohms.
    2 8ohm speaker cabs = 4 ohms
    1 4ohm speaker cab = 4 ohms
    2 4ohms speaker cabs = 2 ohms
    1 8ohm + 1 4ohm speaker cabs = 2.6 ohms.

    2.6 ohms is too low for your amp.

    You can use ONE 4 ohm or two 8ohm speakers at once.

    You SHOULD NOT use a 4ohm and a 8ohm cab at the same time with this amp. The impedence (speaker load in ohms) goes too low. The amp is rated for 4ohms minimum.

    :D

    Joe.
     
  12. mkrtu9

    mkrtu9

    Mar 2, 2006
    Tuscola
    ok, thanks for the help...but, I wasn't saying I want to use both at the same time. I have a 4ohm cab and one 8ohm cab. I plan on keeping them in seperate locations and using the 4ohm cab for practice w/ the band and the 8ohm cab at home. I would be transporting the head back and forth between cabs. so how do i hook up the head to the one 8ohm cab.
     
  13. Lowtonejoe

    Lowtonejoe Supporting Member

    Jul 3, 2004
    Richland, WA
    Cool.

    Good thinking.

    :)

    Um, the same way you would an 8ohm cab.

    I am not sure I understand your question.

    :eyebrow:

    :D

    Joe.
     
  14. Eric Cioe

    Eric Cioe

    Jun 4, 2001
    Missoula, MT
    You can use either output for either impedence cabinet. It isn't like a tube amp, where you have seperate outputs depending on the impedence of the cabinet you're using.

    When you're at home, plug in your cabinet to either of the 1/4 outputs (or speakon). Do the same at practice with the 4-ohm cabinet.
     
  15. mkrtu9

    mkrtu9

    Mar 2, 2006
    Tuscola
    Thanks, that is what was confusing...on my Marshall TSL there is a 1/4 for 8ohm and a 1/4 for 16ohm.
    appriciate the help