On house plugs, the big one is negative-return.
https://www.techwalla.com/articles/how-to-determine-which-speaker-wire-is-positive
Briefly touch the bare ends of the speaker wires to the terminals on a 1.5 volt AA battery. Hold the wire marked with a stripe on the positive cap and the other wire on the negative flat end.
Watch the reaction of the woofer when the wires touch the battery. If the woofer pushed forward, then the polarity is proper. In that case, the wire touching the positive battery cap is the positive wire. If the woofer recoils back, then the polarity is in reverse; the positive wire is touching the negative battery terminal. Mark the positive wire for accurate connection to the amp.
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Meanwhile other things are still happening.
Last edited by john70t; 03-01-2020 at 12:45 PM..
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