I had a course in electrical engineering (advanced physics of conductive metals) that explained the difference in cable directionality... The change is at a metallurgical level it the stucture of the atoms of metal (grain) in the cable. It has to do with the direction in the grains of the metals in the wires, the drawing process, and a multitude of other things. Whether or not you can hear this in your system depends greatly on the ability of your system to resolve minute detail. My system has enough resolution to resolve this difference. It is subtle, but to prove this theory, I conducted a blind cable reversing experiment with some audiophiles and I was not the only one to hear this difference. Some may laugh, some may proclaim they can hear the difference -- but you asked, and here is the answer...
directional cable?
Recently, a hi-fi store loaned me a certain speaker cable and indicated that the cable should be installed in one direction only. When I mentioned this instruction to a friend of mine who is an electronics engineer he laughed for an uncharacteristically long time and then wondered aloud why someone would apply directional bias to a signal that should move equally in either direction. If that were not the case he said you would have some form of diode. Reversing the cable made no audible difference but I have no idea what sonic traits I should listen for. Can anyone shine some light on this?