The most powerful placebo effects in audio threads are induced by costly gear upgrades debate and marketing...
Not so much in a strings of hundred ongoing CUMULATIVE listenings experiments for a long time period with the same gear....My case....Placebo plays in my case also but not so much only and always in the same singular negative way ....
Placebo dont explain mechanical, acoustical electrical noise floor controls by itself only, by the way....
And placebos effects are not only negative"illusions" to eradicate, they can be linked to LEARNED positive biases, like a direction of flow in a road...It is a COMPLEX concept....
If the complexity of ANY concept exceed your processing brain dont use it to insult in a free manner all a category of people indiscriminately...
Thanks....