"Only if you can see the equipment, will you be able to 'hear' the imagined differences / deficiencies. Put everything out of sight and NO ONE can tell or hear a difference. Not wanting to revisit this 'sensitive' subject, except that there might be new people here who do not know the history of blind testing."
But this isn't at all accurate. Harman in particular has done a lot of controlled blind comparisons of loudspeakers, and not only can panelists hear the differences, all but those with hearing deficiencies rank them in the same relative order, whether they're audiophiles or not. Some other speaker manufacturers, including high end manufacturers, use blind listening tests as well.
I gotta wonder, on the basis of your earlier comment, whether you've actually heard a great speaker.