power cord directionality

Its called a circuit. The lines are hot and neutral, not positive and negative. Directional qualities are inherent in the materials not created by manufacturers. And the signals speaker cables and interconnects carry is AC not DC. 

Oh and you will hear it if you try. Or if not then why would it matter that others do?

Audiogon's self-proclaimed reigning theoretical physicist, explains how vibration affects the signal:

Shirley you jest, mc. It’s the same for any cable or fuse or any wire. External vibration distorts the signal. Just like shaking a magnet.

jea48 wonders, How, exactly, does that work? 

geoffkait: I was kind of hoping you could tell me. Just a gut feeling? Oh, well, that’s the way it goes sometimes.

Then his specialty, the word salad:

By the way Poynting angles are not (rpt not) incompatible with the idea of vibration distorting the signal in cables and wires.

Captain Irrelevant strikes (out) again.

If you have an argument that it does, by my guest.
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Not the only thing that's backwards, apparently.