Silver is the best conductor for electricity
Now Hifi to most of us here is a hobby - it is not just a means to an end.
We like to have fun, so before you read the rest (if!) if you like to use silver wires encrusted with ptfe in a twisted fashion - by all means - have your fun.
The difference between silver and copper conductivity is so low, it is not worth mentioning.
At least in the confines of Hifi of any type.
Termination techniques i.e. is it crimped or soldered, and contact resistances between the jacks and sockets are far far higher than the difference between what metal is used as a conductor.
Example;
a one meter length of copper compared to silver has resistance variations of micro ohms.
A mildly corroded jack or socket it would be in tenths of ohms to an ohm in bad cases!
Yet neither makes that much of a difference as headphones rarely go below 10 ohms, so even one ohm won't make a difference. for line outputs of impedances in tens of kilo ohms, they it matters even less.
Try it if you are handy with DIY.
get a one ohm resistor, and connect it in series with one of your leads - then listen - I am sure even in the most revealing setups it wont make a tangible difference.
Now silver wires, came into prominence in the days of LP's and cartridges.
Those days we had moving coil cartridges of impedances of only a few ohm ( I still have a lovely entre one cartridge with a 3 ohm silver winding).
Now these cartridges only managed a few microvolts of output signal, so either they needed a head amp with sensitive loading requirements, or a step-up transformer.
Any how, to reduce to absolute lowest resistance, people started using silver or silver coated conductors for interconnects and windings.
BUT
outside of that very special scenario, copper is as good as silver.
Believe me those silver headphone cables, are just bling! look good, feel good - but electrically serve no purpose.
