A few years back I discussed silver wire with a friend who is an electrical engineer. While he had no experience with silver wire, he did have experience with silver solder where he worked. He said they would often use silver solder when doing maintenance on power systems in the field. He commented that he could measure the conductivity of a connection improve as he melted silver into it displacing the older lead based solder. He felt it wasn't just that the newer joint was in better condition - he said he knew the silver improved the electrical flow through the joint. This guy is a no nonsense type, letting math rule most decisions. Since then I have built up a nice collection of DIY silver wire interconnects with silver RCA plugs and have even replaced some of the female RCAs with silver versions. I cannot swear they are better than copper, but they do well enough to keep me happy.