old speaker polarity?

Discussion in 'Speakers & Subwoofers' started by PeterK, Sep 6, 2004.

  1. PeterK

    PeterK Supporting Actor

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    I have some old speakers that don't have red and black connects at the back. they just have screws. above the one screw is the letter G above the other is the number 8. does anyone know what these markings mean and if they do have to do with polarity which is the red and which is the black equivalent?
     
  2. Wayne A. Pflughaupt

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    The "8" indicates an 8-ohm speaker.

    "8" = red (+)
    "G" = black (-)
     
  3. Andy Goldstein

    Andy Goldstein Stunt Coordinator

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    a quick way to check if the marked polarity coincides with the current industry standard: using a AA or AAA battery and some wire, attach the (-) terminal of the battery to the (-) or 0 or Ground terminal of the speaker. momenteraly touch the positive (+) terminal of the battery to the (+) or red or 8 Ohm (or 4) terminal of the speaker. the speaker cone should move out of the enclosure, and back in when the battery connection is broken. if the opposite happens, the speaker is wired backwards. be aware, some midrange speakers are wired out-of-phase. and do not test high frequency drivers without a crossover network in the circuit. they dont like DC. even for a short time!

    ag.
     

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