I've always had the impression that the concept of "direction" in cables has it's roots in solid engineering principles. That principle being an overall shield connected to the ground terminal at only one end of the cable. There are a couple different schools of thought on where the grounded terminal should be connected, at the signal source (where the signal is weakest), closest to earth ground, or whatever sounds best. Anyway, I think what has happened is that when the cable manufacturers started putting arrows on the cables (to indicate which end the shield was connected to) it just added fuel to the whole debate about cable manufacturers being Voodoo vendors. I mean think about it, that a signal would "flow" better in one direction than another just sounds absurd. But knowing what I just said about the shield being grounded at only one end it kinda makes sense doesn't it.

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Tekdredger