Dear @rauliruegas ,
Thanks for your detailed, albeit somewhat technical, comment.
Yes, I saw the frequency response of the MEMS cartridge on the website, and also as an attachment of a personal eMail from Sawada-san. That mail came as response to my question about the ubiquitous RIAA equalization before the master pressing. As you reasoned correctly, Sawada-san pointed out the amplitude transduction vs. the usual velocity/voltage mechanism, which will still produce accurate bass no matter what RIAA equilibration had been used after the recording. But you also argued correctly that there is indeed increasing instability below 20 Hz (as the frequency response clearly shows). As I pointed out above in my response to @mswale, in my case this manifested itself in strong rumble-pumping of my subs. Yet, after installing the phenomenal KAB rumble filter before my preamp, my bass is now super accurate, and dry, even with the organ-fff of Bach's Toccata from the incredible new soundtrack of Walt Disney's "Fantasia" (which makes my whole room and my chest vibrate with the MEMS in place, btw.). So, yes, you are correct that there might be some correction needed, depending on your other components. Interestingly, though: at Sawada-san's home there was no rumble filter: he had his Esoteric TT standing on a solid block of concrete and used high-sensitivity ancient horn speakers ("Voice of the Theatre") plus a Corona plasma tweeter both fed from an Accuphase integrated. To my ears, though, his system sounded "vintage" in the mid-range, if you know what I mean. I much more prefer what I have here at my house (the Corona, however, was amazing!!!)..