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Telling (+) from (-) on speaker cable!

Discussion in 'Home Cinema Speakers' started by petertully, Sep 11, 2003.

  1. petertully

    petertully
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    I've plastered some cable into a wall but on one cable the markings have worn off and I can't tell the (+) cable from the (-) one! Is there an easy way to do this? Or will it hurts the speakers if I just attempt a trial and error approach?

    Any help much apprieicated!

    Cheers in advance
     
  2. SeaneyC

    SeaneyC
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    Just wire them up, and use the THX phase test to make sure they're all in phase. No harm will come to your speakers if you wire them round "backwards"

    Sean
     
  3. blast

    blast
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    To do this, wire up a loudspeaker at one end of the cable (without the grille on so you can see the cone). Then get somebody to watch it.

    Then get a battery, any type will do (AA is fine) and holding one of the wires on the negative end of the battery with your finger, touch the other wire onto the positive end of the battery.

    If when you touch the wire to the positive end of the battery the cone moves out, and then when you remove the wire from the battery it moves back in, the end you are touching onto the positive end of the battery is the positive cable.

    If when you touch the + end of the battery with the cable the cone sucks in, you are touching the positive end of the battery with the negative cable.
     
  4. petertully

    petertully
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    Thanks guys, much apprieicated!
     
  5. nathan_silly

    nathan_silly
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    Guess. You'll have a 50% chance of getting it right :p
     
  6. pwiles1968

    pwiles1968
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    You could use a Digital Volt Meter set to Impedance or if it has one Buzzer mode, or is that too simple?
     

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