I have 55 hrs on the cart now with no major changes since the 40 hr mark. I was about to write a post here saying that the ART9 failed the piano test as @lewm put it about the Zyx. I had picked up a really clean Japanese pressing of Keith Jarrett's Koln concert, something I hadn't heard since I was a kid, but the piano sounded kind of funky. The percussive dynamics were there and it sounded like a real instrument in a real space, but the timbre was all wrong. The mid range and bass were sucked out and lifeless, as if it wasn't a very good piano.
I did some googling before I posted and I'm glad I did. Turns out - as I'm sure many here know already - that Jarrett requested a Bosendorfer concert grand that evening and got a baby grand practice piano instead, due to an error by the promoter. He said it sounded like a 'modified electric harpsichord'. His adjustment to that piano apparently accounts for the freshness of his playing that night, at least in part. So the ART9 not only did piano well, but it captured the idiosyncrasies of that instrument so effectively that I blamed it on the cartridge. ART9 1, jollytinker 0.
I did some googling before I posted and I'm glad I did. Turns out - as I'm sure many here know already - that Jarrett requested a Bosendorfer concert grand that evening and got a baby grand practice piano instead, due to an error by the promoter. He said it sounded like a 'modified electric harpsichord'. His adjustment to that piano apparently accounts for the freshness of his playing that night, at least in part. So the ART9 not only did piano well, but it captured the idiosyncrasies of that instrument so effectively that I blamed it on the cartridge. ART9 1, jollytinker 0.