I've previously also dismissed the idea of directional cables on the basis that an audio signal is always an alternating current, and consequently the signal travels back and forth in the conductor. But some years ago
i was informed that this is not the complete truth.
The signal is an alternating current that flows in different direction, but the ENERGY is always forced from the source towards the target, in one direction only. And the energy is not travelling within the conductors either i have been informed, rather as an energy field surrounding the conductors, more or less in theinsulation area.
Of course this may be all bull shite, and i can not prove this is correct, and probably not you either... To me though, the reasoning makes sense, and i usually orientate my cabling in the direction he manufacturer ordinates.
TBH the differences in my system are more of a psychological nature; I am content with knowing the cables are properly connected.
However, the swedish cable manufacturer TommyJenving, r.i.p., did manage to reveal measurable differences concerning cable direction.
This can be read about on his brand, Supra, website:
http://www.jenving.se/?p=direct
Br Mike