Wow and what a difference the silver makes! The first selection is more vibrant, better spatial cues/reverberations, imaging, sound-staging and just flat out sounds like a live performance; the copper sound muted in comparison…
There are several trade-offs of silver vs copper sound, which are summarised here: http://sw1xad.co.uk/sound-of-copper-vs-silver-conductors/
The sound you hear comes from a system that is predominantly silver wired. That includes pretty much everything from mains cables up to output transformers and the wiring inside the speakers. The only difference is that we hear a silver interconnect in the first sample and a copper one in the second sample. The same effect will be observed with mains cables that are made either of silver or copper. That will be illustrated in a separate video, which will be published soon.