My question would be, are the measurement devices we currently use able to properly display those differences? Mind you, these are the same smoothed FR graphs that don’t show (or we can’t interpret) slam, detail retrieval, sound stage, etc. from. to be clear, I am not even saying there is a difference, but I am saying that it wouldn’t be inconceivable that the change is more fine grained than our current graphs are able to show. They are clearly limited in this regard. My advice is and always will be listen for yourself and do you best to do the cleanest a/b comparison you can. That way, even if it is placebo, who cares because it is better for your experience.