Newbee-- Good point. And maybe that explains an odd phenomenon with hearing aids. You put them in; you hear sounds you cannot hear otherwise. But what then happens is when you take the aids out, you once again can hear those sounds. (Your notes may explain how the brain can do this--likely by associating those low frequencies with the ones the hearing aids demonstrate to the dumb-ass brain are missing.)
The Absurdity of it All
50-60-70 year old ears stating with certainty that what they hear is proof positive of the efficacy of analog, uber-cables, tweaks...name your favorite latest and greatest audio "advancement." How many rock concerts under the bridge? Did we ever wear ear protection with our chain saws? Believe what you will, but hearing degrades with age and use and abuse. To pontificate authority while relying on damaged goods is akin to the 65 year old golfer believing his new $300 putter is going to improve his game. And his game MAY get better, but it is the belief that matters. Everything matters, but the brain matters the most.