Oxia, obviously you have never listened to the difference directionality makes in signal wires. Plausible explanation? Haven't got one other than the work of Duncan on micro diodes in material caused by dragging it through the die one way.....This would not explain why continuous cast material is still directional now would it? Just use your ears and don't worry about the reasons for directionality to be an issue.....Hint, the direction that allows the tallest stage height is the correct directionality.....Oh, hate those arrows as it is dark behind gear and tiny arrows are hard to see so like to use a green "Load" band on wires I make....