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In this video, one of the ways to determine the positive pole and (pole) negative pole of the speaker, using the 1.5 volt battery and connecting the positive & negative battery voltage to the negative positive pole of the speaker.
if positive polarity = inphase,
then the conus / voice coil speaker will move forward from the direction of the magnet.
if negative polarity = outphase,
then the conus / voice coil speaker will move backward from the direction of the magnet.