Two heads one cab?

Discussion in 'Amps and Cabs [BG]' started by Rocker47, Oct 10, 2011.


  1. Rocker47

    Rocker47 Supporting Member

    Nov 3, 2009
    Alberta, Canada
    I am thinking of running two heads, but have never done anything like it before. Is it possible to run two heads into my Ampeg 8/10 and use a swtich to go back and forth between? If so, what switch do I need?
     
  2. lowendrv

    lowendrv

    Dec 12, 2007
    SoCal
  3. Rocker47

    Rocker47 Supporting Member

    Nov 3, 2009
    Alberta, Canada
    Geeze, thanks! It's that easy. Mine is the 8/10e, but I think I can get it to work for me! Cool!
     
  4. BassmanPaul

    BassmanPaul Inactive

    More importantly what are the amplifiers you intend to use??
     
  5. jungleheat

    jungleheat Inactive

    Jun 19, 2011
    DC
    A setup like in that Ampeg manual would work, but if you want to "switch" between heads (rather than using both at the same time), you'd be wasting half the size/weight of the cab, since you'd only be using 4 10s at a time.

    A better option (although more expensive) would be a head switcher. I know Radial makes one, I think it's called the Head Bone and costs about $250. That would allow you to run speaker outputs from both heads into the switcher, and then a single speaker cable out to the cab. This way when you switch the heads, you get the different sound of each head, but with the full 8x10 reproducing it (rather than half).

    It really depends on what you are after what setup would work best for you.
     
  6. RickenBoogie

    RickenBoogie

    Jul 22, 2007
    Dallas, TX
    +1 for the radial headbone. Otherwise it's 2 amps with a 410 each.
     
  7. BassmanPaul

    BassmanPaul Inactive

    Before this is even attempted we NEED to know what amplifiers the OP is contemplating using. If one or both are tube heads the requirement of a dummy load on the idle amp needs to be addressed. If the Headbone fills that requirement then fine.
     
  8. jungleheat

    jungleheat Inactive

    Jun 19, 2011
    DC
    I think with the Headbone, you also run your input through it (and then to the front end of your heads) and then it uses relay switching so that as you switch the speaker output of one head to the other, it also cuts out the input signal from one head to the other, which should obviate the need for a dummy load.
     
  9. lowendrv

    lowendrv

    Dec 12, 2007
    SoCal
    I assumed that op just wanted to run the amps in his profile (Peavey Mark viii and GK 1001rb-2) at the same time. Both came be run with a 8ohm load. But I may be wrong that he wants to run both at the same time. If thats case a Headbone or Lehl dual amp switcher would be the answer..
     
  10. jungleheat

    jungleheat Inactive

    Jun 19, 2011
    DC
    That's what he asked. Which is why I suggested the Head Bone.
     
  11. Rocker47

    Rocker47 Supporting Member

    Nov 3, 2009
    Alberta, Canada
    WOW! Thanks guys! Yes I wouldn't use my old Traynor tube head as it isn't powerful enough. I would love to try to run my Peavey and my GK and switch between them both running the full cab. The Head Bone sounds like the answer, but until I can get one I would like to try the dual mode to see if I like the idea of trying to switch back and forth. Now, saying that what type of switch do I need to try this system and make each amp run 4/10's at a time? If I can get used to it I would invest in the head switcher and that would open a whole new world for me. I looked through the Ampeg manual, but it doesn't show how to connect the instrument to the amps. Ahhh so much to learn......thanks again guys!
     
  12. spaz21387

    spaz21387

    Feb 25, 2008
    Portland oregon
    Why not run them both slave one of the heads... take the line out from one amp and run it into the imput of the other amp... the line out only sends a signal no power so it wont hurt the slaved amp. then plug the amps in normally just use a speaker cable from each head... simple... right?
     
  13. coreyfyfe

    coreyfyfe Supporting Member

    Nov 19, 2007
    boston, ma
    That doesn't matter, the issue is that an amp with an output transformer needs to be connected to the proper impedance load or you risk blowing the tubes or transformer. The headbone VT and TS contain load resistors so you can use two tube heads or a tube head and a solid state head respectively. The only issue you'd run into in this way is that load resistors supply an 8 ohm load, so it has to be a tube amp capable of an 8 ohm setting.
     
  14. will33

    will33

    May 22, 2006
    austin,tx
    Tube amps (unless they have shorting jacks) need to be connected to a load (speaker or dummy resistors). That said, assuming you have that all sorted out, you could do it with a simple AB switch but never run a Y switch. Running 2 amps into 1 cab means you're going to lose both amps and maybe the cab.

    This is a pretty simple scenario using ss amps, with tubes, you have to see that the amp not being used in a particular switching scheme is still connected to some load be it a quiet speaker or a bank of dummy resistors.
     
  15. BassmanPaul

    BassmanPaul Inactive

    NO IT DOES NOT!!!! A tube amp while operating NEEDS to have a dummy load or a speaker load connected at all times. That's tube amps 101 stuff!!!
     
  16. anonymous1015111

    anonymous1015111 Guest

    Aug 5, 2011
  17. Unless of course the tube head has a built in dummy load, allthough can't think of one off the top of my head I know there are a few out there with this implimatation.
     
  18. B-string

    B-string Supporting Member

    Even if the amp has a dummy load built in it would be defeated by plugging in a speaker plug, just like a shorting jack will be defeated. :eek:

    I don't suggest building your own switch, if the two amp outputs short to each other during switching one or both may be damaged! If your cab is the stereo 810 you cab switch the cab to stereo (dual mono). Attach one amp to the upper section and the second amp to the lower section. Keep in mind if you want to give the amp attached to the lower section a fair shake you need to step WAY away from the cab to listen. Up close the lower section is entertaining your knees. :D
     
  19. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
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