Directionality Explained

This has to be the baseline to start from. Not just for cable directionality, but why cables sound different. Why the type of dielectric used to cover the wire makes a cable sound different.

I put a 1000 gram weight in your left hand. I put a 1000.1 gram weight in your right hand. Absolutely those weights are different. There is no way one could dispute this and claim they are the same. However, if I was to ask you which one was heavier, you wouldn't have a clue and if 1000 people did the same test, the results would be 500/500 approximately or purely random. No knowledgeable engineer or physicist would dispute inherent directional effects in a cable or any other multi-element series/parallel circuit for that matter. Similar to the 1000 and the 1000.1 grams weights, there is a big difference between a "technical" effect and one that is detectable by a human being.

This "directionality" at least as it applies to audio, would be easy to measure and/or quantify .... sort of like dielectrics, and once quantified, could be evaluated if within the realm of audibility. Transmission line effects are well understood and would be orders of magnitude below audibility. Most bulk circuit effects, i.e. resistance, inductance, capacitance are not even at the level to be audible (unless poorly designed/specified). The direction differences in those values, unless intentional, will be orders of magnitude below that .. or inaudible.

This "directionality" at least as it applies to audio, would be easy to measure and/or quantify .... sort of like dielectrics, and once quantified, could be evaluated if within the realm of audibility

Using this logic, then all cables should sound similar since human hearing can hear any difference. 

Most bulk circuit effects, i.e. resistance, inductance, capacitance are not even at the level to be audible (unless poorly designed/specified).

Again, this logic suggests that our audible ability is so poor we couldn't tell the difference.  But it's been shown our hearing is highly acute.

The direction differences in those values, unless intentional, will be orders of magnitude below that .. or inaudible.

Certain an opinion and not a factual statement.  

There is also the voltage law which must follow the conservation of energy

The voltage changes around any closed loop must sum to zero. No matter what path you take through an electric circuit, if you return to your starting point you must measure the same voltage, constraining the net change around the loop to be zero.

Read this it will tell you everything you want to know about electrical circuits and then some. There is also some good links into sound and hearing read those too.
http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

The voltage changes around any closed loop must sum to zero. No matter what path you take through an electric circuit, if you return to your starting point you must measure the same voltage, constraining the net change around the loop to be zero.

This may be the first time someone using his own logic against himself :-)

Think of a simple voltage divider. The voltage gets smaller and smaller going in the loop. Then at the source, it gets regenerated and we start the same thing all over again.  All the while this going on, the current in the loop is always exactly the same.

Since voltage is electric potential energy per unit charge if voltage doesn't sum to zero in a closed loop then you've violated the conservation of energy.