Well, I'm going by memory at this point, but as I recall there was something in the upper mids / lower treble that just - over long listening sessions - seemed not as natural in my system as the overall feeling I got with the Maestro. The difference was minor in the grand scheme of things, but I just felt over hours of listening that I got a more realistic, natural sound and presentation top to bottom with the Maestro. I suspect I could have changed some ICs in my system and the choice could have easily been the Tesla. I didn't dislike it by any means. The Maestro just helped my system sound more like what I hear when I go to classical and jazz performances. Sorry I can't recollect it at this point with the standard audio jargon.
If it helps, I liked the Tesla SE better than the Oyaide R1.
If it helps, I liked the Tesla SE better than the Oyaide R1.