I will just address the silver and copper usage combination. Silver is a slightly better conductor than copper (or even gold) but I would be amazed if you could hear or measure a difference if you used say 24 awg silver and the same gauge copper all other things being equal. If you use solid silver of 24 awg it is going to conduct better than stranded silver of the same gauge because you would have air gaps between conductors; the higher the strand count the less gaps. When you add both reasons together, I would personally use a 22 or 23 awg copper with the 24 awg solid silver. It does make sense to use pure silver, the silver plated copper is just wrong if you if you know or learn anything about skin effect. I personally prefer copper over silver and so say the people I have used for audio testing. (about 60 to date).