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any experience using an extra speaker out of phase?

Discussion in 'Amp Central Station' started by Phat Cat, Aug 18, 2014.

  1. Phat Cat

    Phat Cat NEW MEMBER!

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    Hi,

    I´ve done some interesting experiments using an extra speaker cab. in combination with my combo.

    The combo is an Open Back type.
    The extra speaker is a Closed back type.

    The listening setup is with the Combo positioned on top of the extra speaker cabinet (approx. 1 meter from a backwall.)

    I´ve found that the sound is absolutely great :p when the extra speaker cabinet is pointing forwards (like the combo), but with the extra speaker wired up out-of-phase ! In normal speaker theory, this is NOT recommendable because of cancellation etc.

    (The two drivers are both 10" guitarspeakers, but not identical. The frequencyresponse and sensitivity for two drivers are therefore (slightly)different from each other.)

    I wonder if others out there has done similar experiments ? Best Regards,
     
  2. studio

    studio Poster Extraordinaire

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    Sure you can do that.

    there are manufacturers that wire up speakers out of phase
    all the time.

    Cone excursion is out of phase (woofer usually) when
    utilizing a passive radiator design. That's one example.

    You could also use both speakers in phase and move one cabinet
    further back than he other and create a different phase
    experiment. The possibilities are endless because the amount
    of "out of phase" can be controlled and manipulated too.

    Audio engineers do this with microphone placement all the time.
    There's a 3:1 rule and then there's also the ability to correct
    phase. Two examples, using multiple drum mics that might
    create phase issues and multiple mics on a podium used for
    a formal presentation.

    Your speaker setup is just the reciprocal of those two examples.
    Have fun!
     
  3. studio

    studio Poster Extraordinaire

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    Try your phase experiments....then record them!

    That will take you into next year!
     
  4. Crobbins

    Crobbins Friend of Leo's Ad Free Member

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    I found this video interesting.

     
  5. Wally

    Wally Telefied Ad Free Member

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    I have been using that battery test for years to determine if a speaker is 'functional' or to test polarity. I don't hold that second lead on the post for any length of time as he does in the video....that is, the cone is never held at the end of the excursion. I swipe the second contact across the speaker connection tab for a make and break thing.
    I am not saying that his method does harm, but the method I use certainly will not.
    FWIW, if you hold that speaker cone at full excursion with the battery voltage long enough, that voice coil will fail.....dead speaker.
     
  6. backline

    backline Tele-Afflicted

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    That is in teresting OP.
    A human cannot hear phase difference, so as proximty increases, I wonder if phase cancellation becomes a non-issue.
    I have heard the effect of phase cancellation in a 2x12, but what about (2) 1x12 that are 10 feet apart.?
    I guess the answer, as aleways, would be in a blind test.
    Not a "test" where guys say they can hear a difference when THEY do it...but can people tell you when the spekers are in phase or out of phase when they do not know if the switch is flipped or not.
     
  7. steveneddy

    steveneddy Tele-Meister

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    Another way to play with phase between two different speakers would be to point the closed back cabinet at you - and since the open back cab is essentially the rear - or - out of phase sound - point the open back away from you.

    I have run a clubs and larger venues this way to get a fuller or specific sound on stage - and I believe that this was a common practice back in the early touring days - you know - late 50's and through the 60's and maybe early 70's.
     
  8. String Tree

    String Tree Doctor of Teleocity Ad Free Member

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    You can have all kinds of fun with Phasing.

    I had it in my PA system back in the early 90's, drove me nuts until I got it figgered out.

    As for Guitar Speakers, where you place them and where you stand to hear them is everything.
    A very subjective thing.

    I have a friend who wired-up two cabs out-of-phase with each other.
    Took them in to a Studio, placed them so a Ribbon Mic was directly between them. He loved it.

    Hope you do too, best of luck.
     
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