You have not very good memory about but I posted twice ( along few years.) that RIAA chart where in one of those ocassions you ask to me how was the response over the limits of that chart: 8hz to 40khz and I answered to you that the chart only showed RIAA frequency response and its deviations ( the unit frequency response goes from 0hz to over 1 Mhz. ) and you ask about because in the chart the response was totally flat not only between 20hz to 20khz that's the RIAA requisit but over that 8hz to 40khz and if I remember ( because I don't have in hand now. ) the deviation on what you seen was 0.015dbs and this number improved over up-grades.
Additional characteristics of that unit is that's fully regulated input to output and that the cartridge signal pass only for two discrete gain phono stages.
Btw, exist on other 6 gentlemans that like me are lucky enough to own it.
As fact some other gentlemans that post here and in other internet audio forums ( including a very well regarded proffesional reviewer. ) and some of them ( I know this. ) that even had the opportunity to lisented the unit in its own system losted the opportunity to buy that unit for true " penauts " and prefered another way to go.
Anyway, the important issue is that main target: stay truer to the recording where as the TT/tonearm and each link in the system as the phonolinepreamp is critical an important.
All depends which is each one of us home audio system main target.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.