@rauliruegas Please also refer to the graph near the top of Mr. Galo’s excellent article called Figure 1;
http://www.smartdev.com/RIAA.html
It refers to this graph as the “typical” RIAA response; in reality, it is far from the “ideal” response that one gets from the theoretical filters due to interaction of those filters. This, not the “ideal”, is what we have all been listening to for years with magnetic cartridges! Superimpose a 6dB/octave curve (Strain Gauge) and you will find that it deviates less than plus or minus one dB.
Unfortunately this link took me somewhere else. Can you check it please?
I thought this part of your quote best and shows that he knows there is a region that needs to fall at 6 dB/octave to get RIAA response. The problem remains on how to get it back to flat from 2200 Hz up.
Peter Knows.