Please help me understand

Why not just believe what you wish, but when you try to justify your beliefs it gets kind of silly. It's obvious that all the so-called analogies are not applicable. To try and discredit science in order to say one amp sounds BETTER than another, is just plain silly. The point is conceded, You can hear it all.

"The human ear is more sensitive than any measuring tool."

You sure you don't want to rethink this statement?

"The human ear is more sensitive than any measuring tool."

My post was primarily in response to the statement above. It should be self-evident that human senses, among the animal kingdom, SUCK!! we build machines all the time, to see, hear, smell, and detect things that human senses cannot. We have systems on submarines that can ID other subs by the sound they make. I am sure a machine can be built to ID every amp on the planet, based of that amp's output of a known input. But, who would want to do that? My post may have been an over statement, but if people say they can hear wire and amps and all the rest, FINE! Just leave science out of it.
Just food for thought, your family pet 'hears' more of your high-end system than you do. :) Maybe we need a K-9 audiogon hahahahahah those would be some interesting threads!!
Peace.

"In the mean while we have ears to rely on. Rok2id I`ll assume when you audition and decide to purchase your'audio' components you listened to them rather then just read the measurements and buy based on that criteria alone. "

actually, that is exactly what I do. I have never auditioned a piece of gear, and that includes speakers. I bought my JBL 150s because they were 'known' to be good party speakers. I got my polk Ls90s, because AUDIO magazine said they sounded just as good as the high end stuff, and FT Hood got a truckload of them and sold them for 600 a pair. MSRP was 1600. I got my Polk Lsi 15s because they were said to be better than the Ls90s.

Sadly, my current and past gear has not been worthy of an audition. One more great thing about lo-fi. plus, you save on gas. My next speakers will cost around 5000, so there is an audition in my future. :)

Man: 20Hz-20kHz
Dog: 40Hz-40kHz

Same number of octaves (10)

Based on your data, you agree with me. Since Dogs don't listen to loud rock music or use headphones, or work around loud high pitched machinery, etc.... they can probably hear from 40-40k most of their lives. I doubt if anyone on a'gon can hear 20-20k flat.
Peace.

Unsound, you have spoiled everything by introducing reasoned, well thought out common sense.

Maybe the machines can 'hear' all there is to hear. They hear everything the human sense of hearing detects. maybe the key is, how the brain interpets and processes those sounds. Machine can't do that. And that could be different for different people. Thats how some people can listen to Mozart and 'hear' noise and then get all weepy eyed ove tom waits. Your post was very informative.
Peace.