speaker cable polarity standard

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In an XLR 1 is gnd. 2 is + and 3 -. When you use an XLR as a two wire connector, usually you will find 1 and 3 shorted. But in your case, it is quite possible that 2 and 3 are + and - respectively and 1 is shield that is connected to body/chassis at one end (usually Source end) and left floating at the Load end.
 
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