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Re: Speaker polarity
Set your multimeter to DC voltage (similar to testing whether the car battery is putting out 12v or not). Connect the Positive multimeter cable to one terminal of the speaker, and the negative to the other terminal. If you read a negative voltage, then the positive is touching the negative terminal, and vice-versa. Flip the red/black leads from your multimeter and you should get a positive reading, which means you should have the correct polarity. Incidentally, this will also tell you if your speaker is blown (it should give you impedence, but if it doesn't, your speaker might be toast).
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