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And if a frog had wings it wouldn't bump it's ass hopping.
*sigh*
Ok, let's say you have a headphone cable that is 12 feet long and uses 24 gauge wire.
The round trip resistance if the wire were made of copper will be about 0.6187 ohms. For silver, 0.5798 ohms. For a whopping difference of 0.037 ohms.
Now let's say you're driving a headphone with a 25 ohm impedance. That 0.037 ohm difference means that the copper cable will attenuate the signal by 0.0217 dB compared to the silver cable. And it will be smaller still for higher impedance headphones. You're not going to hear a 0.0217 dB level change even if you're doing instant switching listening to a single tone in the most sensitive range of our hearing, let alone listening to music.
I'm not equating small effects with no effects, I'm equating to meaningless effects.
Let's say I bump the copper wire gauge from 24 to 23. Now that copper cable will have less resistance than the silver cable. And there are any number of headphone cables out there using various gauge wire, some copper, some silver, some of the copper cables will have lower resistance than some silver cables and vice versa. And of course not everyone uses the same length of cable which just adds another variable to the mix.
se
I am in no position to say whether or not your analysis is correct as it goes. However you are clearly not addressing the issue of dynamics.