Originally Posted by
SkyDog75
So long as the signal gets successfully transmitted to the derailleur, it'll shift exactly the same regardless of whether the wire is silver or copper. Not that you have a choice anyway, since Shimano doesn't sell Di2 e-tube wires in different configurations; just different lengths.
(Some people claim to hear a difference between silver and copper wire on analog circuits like speakers. I don't buy it. Neither does my oscilloscope. And it makes literally zero difference in a digital circuit where the signal is binary. Ones and zeroes are ones and zeroes, regardless of the transmission medium.)
I think (hope) Barabaika really knows that only DI2 groups use electric wires and that he was also kidding about the silver and gold wire sets. At least I'll give him credit for being facetious until he proves otherwise.
That said, there is a significant market for absurdly priced "premium" connector and speaker wires for sound systems among the naive. P.T. Barnum's 1st law is alive and well; "There is a sucker born every minute."