Mathieulh
100+ Head-Fier
1. You can argue human ears are not as good as equipment in the measurements they are designed for, but those equipment are not capable to explain why people prefer some audio reproduction over another;
2&4. I, and many people here won't bother to do such a test, to be honest, placebo effect or not is not most important matter, enjoy or not is. You can try it out, come back and tell us your finding, though.
As always, you are entitled to your opinion. At the same time, please respect others' observation about their own preference in sound, even if you think that is non-sense (to you).
About 1:
In regards to this specific argument, it is not about saying "This destination J or E or whatever sounds better than XYZ" it's about proving, through measurement, the sound in destination J (or E or whatever) is different from the sound in destination XYZ)
Ie. We don't care about the quality of the sound signature here, just whether the sound in both destinations, using the same equipment, is identical (margin of error notwithstanding) or not. (you compare both curves and see if you have a match, it's as simple as that). It has nothing to do with how each curve sounds or if one sounds better than the other, since the first step is to find whether or not both curves are different in the first place (that's what the argument is all about).
This can 100% be measured.