has anyone heard the sound of a UFO?

Or measured the sound qualities of the Holly Grail?

Les wrote:

Mark,

You obviously know way too much about how the human ear and testing devices
actually work to be productive in this discussion. Here you are providing
scientific evidence and displaying a strong understanding of the subject
matter. Noone wants that, we want conspiracy theories about test equipment
and talk about magical and mysterious unknowns that we can all perceive in
different ways. That way noone can ever be wrong and everyone can be right!
Get it together.

(Note for the readers who are unable to detect sarcasm. The above paragraph
is dripping with it, there is so much of it that right now it should be
leaking out your computer's open ports. I now return you to your regularly
scheduled flame-war.)

Les