Raul et al,
Your argument on equalisation is irrelevant. Strain gauge cartridges have a non linear output and therefore require different "equalisation" to achieve a flat response. My understanding is that the output is close to the inverse of the riaa curve and the compensation required from the phono is not far from flat.
Nonwithstanding that, you actually need multiple phono preamplifiers to reproduce records properly as there are differences arising from the use of different cutterhead angles from label to label even for standard riaa. I have a colleague who has analysed the cutterhead angles across the various labels and recording studios, and has a built phono stage with adjusted riaa compensation for the various cutterhead angles. Records I have heard that supposedly conform to standard riaa, for which the riaa compensation has been adjusted for the cutterhead angle have been revelatory.
Your argument on equalisation is irrelevant. Strain gauge cartridges have a non linear output and therefore require different "equalisation" to achieve a flat response. My understanding is that the output is close to the inverse of the riaa curve and the compensation required from the phono is not far from flat.
Nonwithstanding that, you actually need multiple phono preamplifiers to reproduce records properly as there are differences arising from the use of different cutterhead angles from label to label even for standard riaa. I have a colleague who has analysed the cutterhead angles across the various labels and recording studios, and has a built phono stage with adjusted riaa compensation for the various cutterhead angles. Records I have heard that supposedly conform to standard riaa, for which the riaa compensation has been adjusted for the cutterhead angle have been revelatory.