I definitely hear my system differently when I am hosting another audiophile. I don't think it's their mass , but somehow I hear it through their ears more. For instance, I will hear negative aspects I never heard when listening with someone and they will comment on these things too. This has happened time and time again. Apart from visual cues, I think there is some kind of neural link that happens! Not that I can describe this or understand it. Although it sounds like so much WOO, its been a repeatable experience for me.