Transfer LP TO CD


richie00boy is correct. Software equalizing costs on dynamic range.
Each Bit represents app. 6dB of dynamic range. The RIAA-curvature spans roughly a 40dB range between 20Hz and 20kHz, So one has to spare 7bits for the equing alone. Add to this a headroom of 1 to 2 bits to avoid clipping and you end up with at least 8 to 9 Bits of the ADC´s resolution. In case of a 20Bit ADC this means that just 11-12 bits are left free, representing a marginal dynamic range of just 66-72dB.
This dynamic range is only applicable in the case that the ADC is supplied with just the right voltage levels for it´s reference voltage and signal input voltage. Since most ADC´s reference voltage settle between 3.3V and 5V the phono-cartridge signal requires linear amplification, or the reference voltage needs to be lowered to match the cartridges output voltage. The latter costs resolution because of noise issues. The former would be the preferrably solution, but if You need amplification anyway, what´s the sense then in not to use hardware equing at the same and omitting with software equing alltogether?
IMHO using a fine phono-stage with linear output, driving an ADC with healthy levels of voltage is still the finest solution.