PapillonIrl,
The Rupert Neve article was very interesting.
The part that Tubedude was referring to (if my convuloted memory serves me correct) discussed testing some new preamp designs. Two of the pre's were being A/B'd and on the bench they were fairly identical in the 20Hz - 20,000 or so Hz but one of them had a dip or roll off in the the higher frequencies (above what is audible for humans) BUT all of the "golden ear" boys and gilrs could consistantly hear a subtle but distinct difference favoring the one that had the improved frequency response in the above humanly audible range.
The legendary but humble Mr. Neve was at a loss for a definitive explanation. It has been a couple weeks since I read the article so the details are fuzzy but he did theorize that even though we can not hear above certain frequencies as individual tones the presence of those frequencies when mixed in with the whole tone did some how affect out perception of the sound.
All of this leads me back to believing that sound and aucoustics are still part voodoo science.
I don't think I will ever have ears golden enough to tell some of those differences myself so I will reistrict my bang for the buck evaluations on what I can hear.
Will a 100,000 frequency response help? Sounds like there will be a debate about this but I would not pay extra money for it unless I could hear the difference myself.