What on God's earth makes anyone think that directionality in wire can even be heard in audio signals @ KHz frequencies? If its just pure copper wire- and uniform in make, thickness, etc. across a fixed length, its a conductor, and it will conduct both ways the same- assuming all things are equal in the wire and in the "inputs" (i.e. terminations) on each end of said wire.
Having said that, I have seen scientific evidence where in the Southern Hemisphere that electrons flow in the opposite direction than they flow in the Northern Hemisphere. Obviously, impacted by proximity to the magnetic poles of the earth. That said, directionality is possible in the farthest parts of the northern and southern hemispheres, and non-directionality is best observed nearest the equator. I live in Texas and closer to the equator than many in US, and likely this is the reason I don't see any hints of directionality in my stereo IC's and speaker wiring.
Having said that, I have seen scientific evidence where in the Southern Hemisphere that electrons flow in the opposite direction than they flow in the Northern Hemisphere. Obviously, impacted by proximity to the magnetic poles of the earth. That said, directionality is possible in the farthest parts of the northern and southern hemispheres, and non-directionality is best observed nearest the equator. I live in Texas and closer to the equator than many in US, and likely this is the reason I don't see any hints of directionality in my stereo IC's and speaker wiring.