it will "wick away" any EM/RFI noise to the ground pin - to earth
connecting it a both ends may allow EM/RFI into the components circuitry - not good
This is a common technique that can be applied to any cable (i.e. interconnct, mains and speaker cables), PROVIDED the cable has a shield as well as a neutral and signal wire.
Some say you should complete the circuit and attach a wire on the female end of the Shield back to the male side shield. I’m not saying the ground plug on the connector. I read about this on audiophile style and it made a difference in my system with a lower noise floor and tonality.
try it before you knock it.
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