@rsf507 in both demos the set up was pretty simple, I like simple and streamlined systems. He had a PS audio Stellar Strata MK2, being fed by a streaming unit (forgot what brand or unit), paired with Paradigm Persona 5F's.
I chose a familiar track (to me), and he played the track with an Audio Quest Monsson AC cable. He would then shut down the amp, replace the AQ with his, turn the amp back on and play the same track.
The differences I heard were subtle, but noted. My wife who is not one of us had some comments. There appeared to me to be more focused sound overall, increased clarity, more open as well. Another listener said something to the effect that he could hear some reflection of drums within the studio recording. I wasn't necessarily paying attention to that.

