Hello,

In addition to the Fletcher-Munson equal loudness curves describing our
psycho-acoustic response, are there any curves to describe distortion in the
ears?

ie. Does each set of ears/brain have a second and third order
intermodulation intercept point?

ie. Can you be bombarded with large SPLs of pure sinewaves at 20kHz and
24kHz and perceive 4kHz (F2-F1) and 16kHz (2F1-F2).

I'm sure it's vastly more complicated than this....?