hifiman5,
OP - shadorne and the other measurers insist that if you can't measure it you won't hear it...you might convince yourself you did, but what the hell do your ears know? I mean really who are your ears to tell your brain what sounds are entering them. Much better to have a man-made device measure sounds which your inferior organic listening devices can not perceive. Sheesh!
I assume you wouldn't scoff at the idea of a carbon monoxide detector for use in your home, on similar grounds? "My senses have served me fine, I mean who is your nose to tell your brain what substances are entering them?" (But of course, carbon monoxide detectors are there because your senses WON'T likely detect odorless Carbon Monoxide in your environment).
Obviously, we invent measurement devices because our senses are limited at detecting what is actually there. The same goes for our hearing. So we know we can measure many things we can't sense, including that we can't hear. We can know "something is there" even if our senses can't detect it. And of course we can also measure plenty that we hear.
If you are suggesting you can hear things that can't be measured, the question is: how do you know?
The reply "Well...I heard it!" doesn't take in to account how your perception can be mistaken.
Also, think of it this way: Expensive, boutique audiophile cables purport to "fix" problems found in other cables. But if instruments can't detect those problems...how would you know they are there in the first place?
Notice that most cable companies start of with TECHNICAL claims about a problem, alluding to phenomenon known from having been measured by instruments in the first place. Look for instance at the Cardas link where in describing issues with cables they reference:
microphonics dielectric characteristics of insulators
high input impedance
Piezoelectric effect
uneven distribution of the charge
Mechanical stress
And yet, despite appealing to a set of measurable problems, they do not produce measurements showing they fixed those technical problems. You go directly from technical sounding descriptions...to marketing and subjective anecdotes. If it was a technical measurable problem with cables in the first place, and they fixed that technical problem in their design, where are the measurements showing this to be the case?
(And there is also the issue of how they have drawn the line between any of those technical "problems" to their audible consequences in the first place).