"---MIKE---" wrote in message
...
I don't know how true this is but I used to hear that it was necessary
to compensate for the slower speed at the inner grooves of an LP. This
compensation could be a boost in the higher frequencies or a boost in
the overall levels. Does anyone know about this?

If that was the case, it would be done in the mastering process--not during
playback.

Norm Strong