Unique 4x12 wiring

Discussion in 'Amps and Cabs' started by DetourMS, Oct 21, 2005.


  1. DetourMS

    DetourMS Guest

    A friend e-mailed me asking if this could be done. I told him I would ask the experts:

    I know I am going to have to worry about impedance matching, but do you think I can do the following?

    Two inputs (A and B) into my 4x12 with a three-way toggle switch.
    Position 1: All four speakers only input A.
    Position 2: Two speakers input from A, other two from B.
    Position 3: All four speakers only input B.
     
  2. SteveVHT

    SteveVHT Member

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    Are you trying to use 2 heads????
    If you are, I would be concerned with not having a load on one of the heads.
    If you're not going to use 2 heads, then I don't get the point of the 3rd position, which is the same as the first.
    Steve
     
  3. DetourMS

    DetourMS Guest

    That is what he is trying to do.
     
  4. SteveVHT

    SteveVHT Member

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  5. DetourMS

    DetourMS Guest

  6. Roccaforte Amps

    Roccaforte Amps Member

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    If you're going to have all 4 speakers on input A,
    why be able to have it on input B?
    One switch won't do the switching you're asking about.
     
  7. sovtekking

    sovtekking Supporting Member

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    If he is going to use two heads, the I would wire it up like this..
    A-4 Speakers together
    B-Two Right side (one bottom and one top together, seems to sound best this way)
    C-Two Left side (Same matchup, one bottom, one top)

    That way you dont have to worry about impedance matching with the headtrip, but you still get use of both heads without killing a transformer and spending a ton of extra money...

    one of the amp guru's could hook you up with a schematic for this set-up, my H&K 212 was similar to this. Hope you get that figured out!!
     
  8. DetourMS

    DetourMS Guest

    This works, but we are trying to figure out a ay to utilize all 4 speakers when running just one head.
     
  9. drbob1

    drbob1 Silver Supporting Member

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    Well, you could do this switching:
    1: 4 speakers on A, dummy load on B
    2: 2 speakers on A, 2 on B
    3: 4 speakers on B, dummy load on A

    Since you're using a toggle, you can switch both amps to standby before changing the cab settings, protecting them from blowing a transformer.
     
  10. DetourMS

    DetourMS Guest

    OK. This would be a solution. I am speaker novice, so any info on wiring and how to create the dummy load?
     
  11. 908SSP

    908SSP Member

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    Weber sells load resistors. I bought some that were 50 watts and 16 ohms. I don't remember if these were the biggest ones he sells. You would treat these exactly like they were speakers. Use two with a 100 watt head. They are cheap a couple bucks a piece. You can make a little heat sink type stand off and bolt them in side your cab just make them secure enough not to come loose or rattle.
     
  12. TAVD

    TAVD Guitar Player Gold Supporting Member

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    Simple. Use 2 speaker cables.
     
  13. Souled Out

    Souled Out Member

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    use this web site for contact info. These people can help do what you want to do. Very state of the art and will be released to public very soon. Let me know what you think after speaking with them.

    http://www.tone-doctor-llc.com/pages/intro.php
     

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