It's also worth noting that not only are the ears more sensitive in the midrange area but that very few people are immune to the placebo effect. The art of objectively listening is something that most people think they have, but is so mood/viewpoint dependent that those who can remove themselves emotionally from a listening analysis can only do this for a very short period of time.Our ears are more sensitive to frequency response than anything else. This is basic human physiology. Our ears are primarily FFT analyzers and understand frequency response more than any other auditory metric. I read all kinds of theories from guitar players on what they think they are hearing and yet what they really are hearing is simply a frequency response difference.
Of course, this is IMHO, but I hope to do some research to back it up at some stage........ as in, before I die.