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miketlse
"does this mean that the resistance of a coated cable, effectively changes with frequency?"
Just to mention
my opinion on Silver coated cables, they maybe technically better for digital cables
but for analogue, it is debatable and it depends on the cable manufacturers philosophy and the price range ( and perhaps their justification) but imo, I see the main benefits of silver plated as an aid to tune a speaker based system, eg. to give more top end detail if needed.
Seemingly, higher frequency HF signals tend to travel close to the cables outer conductor surface and the lower LF signals more in the center of the conductor.
The signals travels faster in Silver than in Copper and that is why some people may find that Silver analogue cables sound initially impressive but maybe fatiquing in the longer term.
I personally stick with Copper speaker cables and analogue interconnects and in my system I use solid core copper speaker cable and I even rewired my speakers internals with solid core (which is a pain to work with) but I beleive I can hear the benefits as I replaced the original Silver plated cable which was making my system too bright for my liking.
I do not want to derail this thread but wanted to give a bit of my experience and research that I did on cables a few years ago.