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On 5 Mar 2006 19:54:15 GMT, (---MIKE---) wrote:

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?

It's common to introduce level boost across the record surface,
sometimes as crudely as by a potentiometer attached by string to the
cutter! This is necessary because pickup carts are sensitive to
velocity, and there's a roughly 2 to 1 ratio of linear groove speed
from outer to inner. Hence, without level boost, the music would
suffer about 6dB level loss from outer to inner tracks.
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Stewart Pinkerton | Music is Art - Audio is Engineering