How does cable construction affect sonic character?

It might be old hat for some, but it's not necessarily so for everyone.

Not all cables can pass all frequencies precisely (no mater what the level) without any timing delays or transient loss. That's especially true for higher powered situations such as speaker cables.

Manufacturers play on this fact and produce exotic products that are designed to extract massive sums from gullible audiophiles.

That's why this discussion is important and shouldn't dismissed as repetitive. 
 

As someone said, it's a religion. It can't be proven but believers have faith. 

Interesting video. 

A good sommelier can determine by taste which particular area a wine comes from, which grape, even which particular vineyard and which year. It comes from experience and his/her hyper-sensitive taste buds and smell. Can a laboratory instrument capable of chemical measurements do the same? I doubt it.

I think our listening skills are like that. Some of us are more sensitive to sounds than others. I think listening over a long period of time, and listening to lots of different systems and components brings experience to be able to discern like a good sommelier does. Once you have it, it’s very easy to hear very subtle differences.

Its only miraculous if you deny that an application of well understood mathmatical principles is responsible for achieving what believers applaud.

This is possibly not something those who have been reading audio reviews (perhaps for decades) have been taught to believe.