Reverse Polarity Speaker Cable. Wtf??

Discussion in 'Cabinets & Speakers' started by mtm105, May 11, 2018.

  1. mtm105

    mtm105 Well-Known Member

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    just when I thought that life wasn't complicated as it is.

    I read "polarity matters when more than one instrument is being played. As a solo instrument, nothing to worry about."

    "Easy to check polarity.The tip is +. Use a 9v battery and just touch it from the + to - and see which way the cones move.Forward or backwards. Then try the polarity both ways and see which sound you like better."

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    "Another point: phase shift in an amplifier is not absolute - just because you have an odd number of inverting stages does not mean that you have a signal 180 degrees out of phase with the input signal. Every partially-bypassed cathode stage, coupling network, tone stack, and output transformer imparts a frequency-dependent phase shift to the signal.

    If you take the time to run a phase/frequency plot, you will see that it goes all over the place. In fact, you can make a passive network that will have enough phase shift to give you a complete 180 degrees, so you can have an amplifier with an odd number of inverting stages that actually will produce a signal that is in phase with the input! It won't, however, change the polarity of a transient signal, which will still be inverted."
     
    Last edited: May 11, 2018
  2. Micky

    Micky Well-Known Member VIP Member

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    WTF?
     
  3. Rich_S

    Rich_S Active Member

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    Nonsense.

    However, speaker polarity does matter if you're running your guitar through multiple amps. Some amps have a different phase output than others. Hell, many Fenders have different phase between the Normal and Vibrato channels. So, if you're the type to stack up two or more different amps and run them all at the same time, it might be worth investigating reversed-phase speaker cables.

    Although, most good splitters and A/B/Y switches have phase-swap switches on them.

    Another good application of a phase-reversing speaker cable is if you're running two cabs with different phase off the same amp. If you don't have the time to pull the back off one cab and swap all the little spade lugs on the speakers, the swapped cable is a faster & easier solution.

    But using a reversed phase speaker cable to alter your phase relationship to the other instruments on stage? Nonsense.
     
    Last edited: May 11, 2018
  4. MemphisMarshallMan

    MemphisMarshallMan Active Member

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    Also be aware that some speaker companies might observe reverse polarity in their speakers..namely JBL, but always check any brand just to be sure. Somebody may also have installed a reconed speaker in there that was incorrectly wired.
    Not many people use jbl's in their guitar rigs, but over my career I have known 2 well known national level guitar players who did. When I informed their techs about it neither one believed me until they checked it out for themselves. It was one of those, "Well I'll be damned, they are reverse polarity." moments.
    When I first get any speaker cabinet (guitar, bass or PA) I always test for polarity, use deoxit on the jacks, make sure all screws and joints and casters are tight, and check the ohms rating on a meter.
    Never hurts to check.
     
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  5. mickeydg5

    mickeydg5 Well-Known Member VIP Member

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    I thought this was common sense to people who understand electrocity. What is your point?
     
  6. mtm105

    mtm105 Well-Known Member

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    deoxit?
     
  7. Micky

    Micky Well-Known Member VIP Member

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    I still don't get it.
    Is there a question in there somewhere?
     
  8. ampmadscientist

    ampmadscientist Well-Known Member

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    When the speaker cable is reverse polarity, the music comes out inverted.
    How do you think Hendrix recorded all those reverse guitar solos? Hmm?
    See? I run rings around you logically.
     
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  9. MemphisMarshallMan

    MemphisMarshallMan Active Member

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    DeOxit is a spray contact cleaner that you can spray on speaker connector jacks to remove natural oxidation from the metal. That oxidation causes ohm resistance. I have measured used 1960 cabs with 40+ ohms of resistance before the spray and 14.6 ohms after cleaning.
    Just one of those things to do (like checking polarity) when you get a speaker cabinet.
     
    Last edited: May 16, 2018
  10. mtm105

    mtm105 Well-Known Member

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    LInk would be of benefit. Are there any other uses for Deoxit? I have an old Marshall 12W Marshall Lead SS. The pots are scratchy. Does it help fix?

    https://www.amazon.com/s/?ie=UTF8&k...hvtargid=kwd-286456768&ref=pd_sl_9b0esdpjsu_e
     
  11. chuckharmonjr

    chuckharmonjr Well-Known Member

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    Ok...I am officially confused...what sort of techno babble bullshit is this? Tone is in the reverse polarity speaker cable?
     
  12. rick16v

    rick16v Well-Known Member

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    But then he strung his guitar backwards and played it upside down, reversing the effect once again :eek:
     
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  13. mickeydg5

    mickeydg5 Well-Known Member VIP Member

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    Reverse polarity does not produce reverse sound. It only turns the original upside down.
     
  14. gearhead

    gearhead Member

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    If you run 2 cabs off one head, and one cab has reverse polarity from the other, it cancels out certain frequencies.
    That is why when making recordings it is recommended to listen to the recording in mono before finishing mastering to stereo. Because in mono you can hear the frequencies being cancelled out. Im not sure that would matter in a live situation, but may be something to check out and see if there is any differences.
     
  15. ampmadscientist

    ampmadscientist Well-Known Member

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    That was technical humor Chucky. :lol::lol::lol:
     
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  16. ampmadscientist

    ampmadscientist Well-Known Member

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    True, inverted first...then re-inverted....resulting in non-inverted.
     
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  17. ampmadscientist

    ampmadscientist Well-Known Member

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  18. ampmadscientist

    ampmadscientist Well-Known Member

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    it cancels out certain frequencies.

    Yes it can cut loudness in half.
     
  19. rick16v

    rick16v Well-Known Member

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    What if he did it whilst looking at his reflection in a mirror!? Mind. Blown.
     
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  20. ampmadscientist

    ampmadscientist Well-Known Member

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    [​IMG] Don't bring that up, I'm freaking out already.
     
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