>it does this because human ears dont perceive all frequencies at the same
>loudness even if they have the same amplitude.  you could find a table in
>almost any acoustics book that shows the relative loudness for all freqs.  you
>could then make a table of the inverse of that function that would be used to
>raise or lower the amplitude at different freqs so that it would sound the
>same loudness across the spectrum.  however, every ear is different, so not
>everyone would perceive it properly.

much luvl!nesz. beaut! = w!nz. humanz = loze 2jourz || enkor kom vouz voulez