Well if you want to go down that route, it's still the same issue. Analogue cables either work or don't. You don't need to spend more than a few £/m before you're going into the realms of differences that are never going to be picked up by the human ear. The claims companies make for the cables don't stand up to any objective evidence (and despite making these cables, the manufacturers never provide any objective evidence!) and are quite easily explained by the placebo effect.
If you still want to ignore the placebo effect, ask yourself why nobody from the hi-fi industry produces real, objective studies showing their products work? If they did, it would allow them to backup bold claims without the worry of the ASA.
This is where issues get crossed in terms and description. Ignoring cost as most pricing is done by what a company can feel they can claim and not linked to the material cost to make the part.
Any reasonable cable will work, as in pass a current. With two different constructed cables with differing LCR values, it maybe possible that an audible difference is heard, better would be subjective, both could be capable of carrying the required current etc.
You could conclude one cable was "transparent" the other modified the signal, but there is nothing to say the transparent one would be preferred when listen to it. The cable that causes a small shift in the sound or balance of higher frequencies might be make the music more enjoyable....
I might have a dull sounding room with loads of soft furnishing for example, using a cable that increased the higher frequencies slightly would be preferable to one that did nothing.
Point is try before you buy, choose what works for your set up and don't judge by cost as that came from the marketing department. If two items sound the same, buy the cheaper one !!!
Placebo is another interesting issue....so just for point of discussion try this theory for size....
There was an interesting documentary some months back on TV.
They did the normal medical trial with some pills. Where those not knowing took a placebo pill and still showed signs of improvement.
They went further.... they then told half the group with the placebo pill what they had been taking.... but asked them to continue taking the placebo pill anyway. The other half stopped.
Even though the group knew they weren't taking any more than fake pills they continued to improve, those that stopped regressed.
The reason given was the belief and act of taking the pill still caused the brain to send the same trigger to release the chemicals that help the body self heal.
Of cause the potential saving to health service could be huge
Another interesting item I believe was on the radio, that scientists still don't understand that well how we hear. They know the basic mechanics, but what goes on in the brain wasn't understood. Other than some chemicals get released. The trigger and stimulus wasn't understood, how certain sounds gave change to moods, emotions and reactions, or even why....
So if you link the placebo effect to one of listening to music.....
What happens when we listen to music, it causes chemicals reactions in the brain to effect our mood and emotions. That isn't the same as lab instrument detecting changes in wave form or frequency response.
If we take a placebo pill we can have release of chemicals in the brain...
So if you change a part in the Hi-Fi system in some ways the effect to the listener can be exactly the same, doesn't matter if the sound actually changed or the listen was just believing it should, the brain will still release those extra chemicals making you "hear" and "feel" that improvement and heightened enjoyment. Either way, the listener gets an "upgrade". The brain was tricked into the same response or reaction. But it was the same reaction.
Remember we listen to music for the emotional satisfaction, not the measurement of sound.... same as we eat attractive looking food, not from little silver foil packets like astronauts, because one is more enjoyable than the other despite what what we might be told that they both contain the same measured nutritiousness.
Just looking at the bigger picture, it's about enjoying time listening to music and how the enjoyment can be increased.
None of the above suggests we should buy expensive magic cables by the way
