I have posted this on here before numerous time I was very skeptical of platforms isolation etc
Took part in a blind test of 3 systems. Heard differences in each system for 3 tracks that were played. Sometimes difficult to distinguish sometimes more obvious.
They were randomised each time as a b c. There was 3 of us doing it and all heard differences.
Turned out all that was being changed was the hifi rack the cd player was being rested on. I had a preference each time for the same platform even though it was randomised. Proved to me there and then