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wrote:
"not knowing what's being played. In fact, I would expect Keller to have
had a better hearing acuity than most of us."

Ms. Keller was deaf blind.

Oops, didn't know that. So why would Mr. Scarpitti say that even she
could tell the difference? Hmmm...

Blind folk have the same hearing as everyone
else, they only use it differently and pay more attention to sounds in a
way sighted folk don't. In the case of testing audio gear, blind folk do
no better then do sighted folk. Blind folk do pay more close attention to
spacial clues based on sound reflection, which might mean they more easily
detect it in recorded music or know it is false if reverb etc. are used to
produce spatial information. They might be able to better comprehend the
space a recording was made in, or know if it is a multi layered pan pot
product.