Differences between cd transports?

Look, it’s not rocket science. Take the case for two wires connected to a speaker, + and -. When the current travels toward the speaker on one wire it travels the opposite direction on the other wire. And vice versa. All you care about is the current traveling toward the speaker, so control the directionality of BOTH wires such that the preferred direction is the one toward the speaker. You don’t care about the opposite direction, the one traveling away from the speaker. It’s not audible. The direction toward the speaker is. The same logic applies to a single wire, e.g. fuse in an AC circuit. Raise your hand if you still don’t get it.

yes this should end, but if, as you said, that the ac in cables is minimal, then shouldn't it running as you said back and forth be minimal, too? 

AND, what about optic cables

Hopefully someone else with electrical knowledge in audio component and cable signal will agree with you, and put a bow on it, as it seems only the two of us are discussing this, and Im not convinced

Be careful what you wish for. Besides, aerospace engineers trump electronics engineers.