You can ignore AV Outlet since they say things like:
 Quote:
All cables are directional. One way sounds better than the other. If the cable has arrows, make sure that you the arrows point towards signal flow. If they do not have arrows, you are best able to tell one channel at a time by listening to vocal music with brightness to the voice. The direction that sounds less edgier is correct.


Which way does alternating current flow again?

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris