Quote:
Originally Posted by Rich400
To clarify the RIAA curve just describes the non linear relationship of bass in the output of the cartridge. By building in an adjustable low pass filter into the circuitry Of my modification I can either increase or reduce the bass level. This will adjust graphically the RIAA curve.
Sorry for not being clearer on this point.
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There are 2 RIAA curves introduced in 1954, one for 78rpm coarse groove and one for 33/45rpm microgroove records. Both involve reducing the bass and increasing the treble when making the stampers used to produce the discs. This distortion has to be removed in playback by increasing the bass and reducing the treble which is what the built-in RIAA stage in post 1954 pre-amps does as well as highly amplifying the low output of moving magnet cartridges. What you are doing is not at all clear.