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Easiest way to check this is a 2 person job, Get a AA battery and tap the wires on the battery, the 2nd person watches the cone, it will either move up or down, If it moves up the polarity is right, if it moves down you need to reverse your wires, as said it does matter as if you have 3 wired right and the 4th wrong it will sound terrible.
This tip was given to me by my uncle who was an old school car radio installer for Strathfield car radios back in the day, never failed me yet!
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