What direct electrical measurement is associated in how large or deep you perceive a soundstage of a recording to be or instrument placement within it?
Irrelevant - though there are interesting possibilities - first you have to show that any changes to the signal once in the system is responsible for that perception (rather than speaker placement and design, mic placement, stereo mixdown, etc.)
But if the signal from one end of the cable measures the same as when it comes out the other end of the cable, then the cable has not affected the signal, and there is not a change as a result of the cable. That is something direct electrical measurement can show - is there a difference as a result of the cable. If there is none, you need to look elsewhere, by definition and function.
Or are you arguing that the perception of spacial imaging is as a result of something other than the electrical signal information, but which can be affected by a cable - because you have a long theoretical row to hoe, to get there if you are.
Edited by liamstrain - 9/6/12 at 3:29pm