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    Checking speaker wiring polarity

    I am finally putting the second pair of speakers in theTrevortommorow and have this recollection of the speaker wiring being different (the wire with the vein being connected to the negative) to how I have put things in, in the past but I am not 100% about this... Apart from taking the dash bits out to check, it is possible tocheck the polarity of the wiring with a multi-meter?

    #2
    imported post

    In short Graham, no the meter will not help. They will work either way round, but if one of the speakers is wired opposite to the other you will get a slightlack of bass response. Just put on some bassy music and reverse one of them to see which is best.

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      #3
      imported post

      Thanks Chris. The speaker have different connectors for +ve and -ve so I will have to try at the joins under the carpets. I was thinking that a voltmeter should have given you a positive or negative - shows what I know!

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        #4
        imported post

        Here's the definitive answer, although it's no credit to me - apart from having torn it out of a mag

        When Ireplaced my unit a while ago I was never sure if I had got this right or not.Then, in the August issue of Classics Monthly, they gave the answer - although thisremainsone of the many jobs still on my 'to-do' list :

        "Connect the wires to the speaker, and then touch the other ends on to the positive and negative terminals of an AA battery. If the polarity at the speakers is correct, the speaker cone will expand outwards, if it's not, it'll 'suck' itself in."

        Cheers

        Julian

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          #5
          imported post

          Thanks Julian. I will try that. If a dc battery does that, then sound played from the amp should also give varying degrees of voltage as well, so will also check with the meter.

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            #6
            imported post

            grahamb wrote:
            Thanks Julian. I will try that. If a dc battery does that, then sound played from the amp should also give varying degrees of voltage as well, so will also check with the meter.
            Hi Graham

            I'll be interested to hear what you find as I'm going to be doing the same thing sometime before, hopefully , too long.

            Cheers

            Julian

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              #7
              imported post

              jleyton wrote:
              Here's the definitive answer, although it's no credit to me - apart from having torn it out of a mag

              When Ireplaced my unit a while ago I was never sure if I had got this right or not.Then, in the August issue of Classics Monthly, they gave the answer - although thisremainsone of the many jobs still on my 'to-do' list :

              "Connect the wires to the speaker, and then touch the other ends on to the positive and negative terminals of an AA battery. If the polarity at the speakers is correct, the speaker cone will expand outwards, if it's not, it'll 'suck' itself in."

              Cheers

              Julian

              I've read that before, but only good from the head unit end, not the speaker end...

              Mike.
              74 Stag (Best Modified 2007), 02 Maserati 4200, 17 BMW M140i, 00 Mitsubishi Pinin

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                #8
                imported post

                Well, at the smallest meter setting you do get a positive and negative reading on the wires, depending on which one you connect to. Suprisingly small voltage though.

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