Re: Need help with 4x12 wiring

Discussion in 'Cabinets & Speakers' started by GUiTAR84, Dec 12, 2010.

  1. GUiTAR84

    GUiTAR84 New Member

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    Hi all. I need your help wiring this 4x12 cab. I bought an empty Peavey XXX cab and I want to load 4 ( 8 ohm- vintage 30's) inside it. The input jack in the back is confusing me. There are no labels on it, 2 input jacks (or 1 in 1 out im guessing) and a center switch (speaker damping?). 4 wires coming off the back of the jack, 2 on each side. Here is a diagram I drew, need someone to help connect the dots. I've spent the past 2 hours searching the net and cannot find a wiring diagram for the XXX 412 cab. This will be going into a JSX that has 16/8/4 ohm cab selector. Please help.

    [​IMG]
     
  2. Adwex

    Adwex New Member

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    I'm not sure.
    You need to determine what the switch does. If it's like a Marshall 1960 cab, it switches from mono to stereo (stereo separates the two sides, mono connects them together).
     
  3. cagamp1

    cagamp1 New Member

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    Try the link:
    Start PDF Download ...
    use the "Looking for a manual" button if it doen't show up.

    That's a mono/stereo jack plate (if it is original). The original speakers were four 16-ohms. The cab was 16-ohm mono (one jack for mono operation) & 8-ohm stereo (each jack).

    Since the writing on the jack plate is gone and your hooking up four 8-ohms, I'd suggest series-parallel with the mono/stereo jack plate. That would give you 16-ohms for each stereo side and 8-ohms for the mono operation. Check your totals with a ohm meter to make sure that jack plate and your speakers are connected properly to match you amps output impedance.
     
  4. happychappy

    happychappy New Member

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    Good set up!! ive just loaded my second cab with 4 vintage 30's. I now blast 2 4x12 cabs all loaded with v 30's. Killer sound!!
    I stripped all the tat out of the cab and just re wired it straight to a new jack. It was a crate cab with some little circuit board and switch combo in it. sod all that guff!!

    This will help.
    Shavano Music Online - Speaker Wiring Results; Impedance Calculator
     
  5. GUiTAR84

    GUiTAR84 New Member

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    Thank you all for the input! My research led me to a series/parallel setup for a total of 8 ohms in mono and 16 for stereo, just like you mentioned. All the wiring diagram's online show how to wire series/parallel in mono.. not sure where to put the other 2 wires for stereo...
     
  6. cagamp1

    cagamp1 New Member

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    What online diagram are you using?
    The switch should either disconnect (for stereo inputs) or parallel (for mono input) the two sides.
     
  7. ckr1231

    ckr1231 Active Member

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    Check what your amp output is.
     
  8. GUiTAR84

    GUiTAR84 New Member

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    So I take it, since my speakers are 8 ohms, and im trying to do a parallel/series for total of 8ohms, I cannot with that stereo input jack?

    Where can I purchase a simple 1/mono input that would screw onto the back of my cab with no issues?

    [​IMG]
     
  9. American Viking

    American Viking Well-Known Member

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    If you are installing 8 ohm speakers in a cabinet I would not use a PCB switchable jack plate. I would just install a single dedicated 8 ohm jack. I would even do the same if using 16 ohm speakers but for a MONO/STEREO switchable cabinet the math won't work right when using 8 ohm speakers.

    Wiring a 4 X 12 Speaker cabinet

    Jumbo Sunshade - Speaker Wiring Diagrams
     
  10. GUiTAR84

    GUiTAR84 New Member

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    K cool, helps me out a lot what you just said. Where can I purchase said 8-ohm jack? Anyone recommend a good retailer?
     
    Last edited: Dec 13, 2010
  11. GUiTAR84

    GUiTAR84 New Member

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    :)
     
    Last edited: Dec 15, 2010

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