I think some of us are missing the point of Miller's post.Non- audiophiles can easily hear changes made in our systems in a blind test.I don't "subject" my guests to the testing ,it's happened a few times by accident.In a recent instance I swapped in some new tubes in my pre while everyone was otherwise occupied outdoors.Later on my SIL requested another listen to the CD that we'd enjoyed earlier and all present immediately noticed the change.My SIL asked if it was a different 'live' recording.
That's not the placebo effect.
That's not the placebo effect.