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Need help as fast as I can get it, as usual..

Discussion in 'Audio & Video' started by bcs4, Mar 14, 2011.

  1. Mar 14, 2011 at 12:47 PM
    #1
    bcs4

    bcs4 [OP] Member

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    Putting new components in the front doors of a 2wd standard cab with window cranks (I mention this because door removal is different, 2 screws in door panel hidden behind snap off panel in door pull).

    Here's my question, both doors have one green wire and one blue wire. Anyone know which is pos and which is neg?

    Thx in advance!
     
  2. Mar 14, 2011 at 1:34 PM
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    bcs4

    bcs4 [OP] Member

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    Great, Thx. I was thinking that but thought I might run in to a phase problem if I installed rears or sub later then I remembered 180 degree inversion on the amp or head unit.

    Thanks again for the quick response!
     
  3. Mar 14, 2011 at 1:34 PM
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    tanzak88

    tanzak88 Well-Known Member

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    Pretty sure it does matter, actually. If the polarity was reversed, the speaker would be rear firing, into the door, instead of into the cabin.

    Correct me if I'm wrong.
     
  4. Mar 14, 2011 at 2:05 PM
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    bcs4

    bcs4 [OP] Member

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    Good point. I guess I'll just do a test listen and see which sounds better. If I can tell a difference I'll post my guess as to which I think is pos and neg.
     
  5. Mar 14, 2011 at 3:49 PM
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    lbridges

    lbridges Well-Known Member

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    Sometimes its hard to tell about Internet intent, but just in case this was serious...

    Wiring is important only in relation to the other speakers in the same frequency band - phase/polarity - as pointed out by PSU Taco85.

    Speaker cones vibrate in and out. So they "fire" both toward the front and rear all the time they are working. This is independent of which post gets the + and which gets the - wire. Some subwoofers are deliberately installed so the rear faces outward. The wiring is exactly the same. The sound is practically the same, only varying if one can hear the mechanics of cone movement, tinsel slap, etc.

    Important (IMO) to the discussion is that a key element for any installation is to prevent sound from the rear reaching the front, and canceling each other out.
     
  6. Mar 14, 2011 at 4:55 PM
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    tanzak88

    tanzak88 Well-Known Member

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    Hmm... interesting. I thought that reversing polarity reverses the firing direction and unless the speaker is reverse mounted, it will sound like shit.
     
  7. Mar 14, 2011 at 6:23 PM
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    lbridges

    lbridges Well-Known Member

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    Nope, and sometimes people will deliberately reverse the polarity of either the tweeter or midbass in one door - primarily due to phase differences induced in the automotive environment (path lengths, reflections, etc.). This assumes the install doesn't include something like the Alpine imprint system.

    When doing a custom install on a vehicle for which lacks experience you should always at least try a reversed polarity setup. It's not a rule, but it never hurts (maybe helps in 10% - that's a SWAG).
     
  8. Mar 14, 2011 at 6:46 PM
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    tanzak88

    tanzak88 Well-Known Member

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    Ahhh interesting. Thanks guys. Learn somethin new every day. I reverse mounted a 12" MTX, cause it was in a smaller box and reversed polarity.. and thought thats what you do... lol.
     
  9. Mar 14, 2011 at 7:08 PM
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    lbridges

    lbridges Well-Known Member

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    That is what you do, but it's to phase match the bass tones from the midbass with the bass tones from the woofer and prevent sound waves interferring with each other.

    Said another way, when the midbass speakers in the door are pushing out, the woofer, being reverse mounted, is pushing backward and they match phase. If you didn't switch the wires, the door would be pushing out and the woofer pushing in, and they would be fighting each other. Conversely, if the woofer was NOT reverse mounted, by matching the wiring they would be pushing together.
     
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