Hi George,
It is true that the "Ears" and the "Feelings" influenced by sound have to rule all decisionmaking. Given that the "ears" and "feelings" are so imporantant to people's ultimate enjoyment of sound, some may find the following linked whitepaper both relevant and interesting.
I fell that a "multidisciplinary approach" by entire teams of qualified specialists is required to better understand the human beings response to sound. Ironically, this suggested approach is often met with bitter resistance from "certain" quarters who claim to be scientists.
In the following linked paper the researchers explain "the natural environment, such as tropical rain forests, usually contains sounds that are extremely rich in HFCs over 100 kHz. From an anthropogenetic point of view, the sensory system of human beings exposed to a natural environment would stand a good chance of developing some physiological sensitivity to HFCs."
We now have commercially available speakers that reach high frequencies in the 100kHz range and we also have microphones such as the new 100kHz Sanken mic.
The availibility of these mic and speaker technologies should make it easier for reaserch teams to construct proper multidisciplinary test suites.
In addition, in the following paper you'll see that the researchers point to the fact that "[i]t is widely known that the upper limit of the audible range of humans varies considerably." You'll also see other examples of high frequency gear as well as some citations to respected audio equipment designers such as Rupert Neve.
For example, the linked paper points out that "artists and engineers working to produce acoustically perfect music for commercial purposes are convinced that the intentional manipulation of HFC above the audible range can positively affect the perception of sound quality (Neve 1992)."
And the researchers findings are summarised in their conclusions which state: "Psychological evaluation indicated that the subjects felt the sound containing an HFC to be
more pleasant than the same sound lacking [i]n HFC."
Given that 100kHz speaker systems and 100kHz mics are now upon us, it is worthwhile and now feasible to construct other test suites on the entire human system utilizing a "multidisciplinary scientific approach" along the lines of the following paper.
http://jn.physiology.org/cgi/content/full/83/6/3548
I'd be curious to see other people's comments about this study, and see if any of them have any ideas of how the human tests conducted by teams of qualified multidisciplinary experts might be improved upon.
In addition, I'd like to see people's suggestions and ideas of what the "Digital Sound Roadmap" or specific steps an "Digital Sound Action Plan" for the future might contain of how we could improve digital sound quality.
The scientific paper shows that it is *all about* human's ears and human feelings, areas which are too often overlooked, or worse, feelings and ears are even "derided" in certain constricted circles. I'm glad there are people in the world like GM with the integrity to remind us to notice our feelings and use our ears.