Hello Christoph, that is difficult to describe. I wrote this in my report:
"It is hard to describe the sound and how it changed over the three days. It is certainly more dynamic and present in the room. The tone is more beautiful and the timbre is more correct. The music comes more to life in the room and it simply sounds more right. This is natural sound to me."
I can now add the following: The instruments and musicians seem more present, more in the room if it is a studio recording, or I am more transported to the venue if it is a "live" recording of instruments on a stage. Everything sounds slightly more real. The sound is more immediate and there seems to be slightly less distortion because it sounds more clean/clear. I have often remarked that the single adjective I would use to describe the BSO performances that I have heard is "clarity". There is now more of that quality.
Yet, it is very relaxed in the sense there is no fatigue. I can listen loud if the music calls for it. There is no harshness in the highs because I think David's cartridge set up is better with lower distortion. Basically, the VTA is now correct, but there is also more nuance and tonal shading. Dynamics were good before, but now they are explosive and clean and open. Everything is slightly more effortless. Also, with the slight adjustments to the cartridge, the new cable, and the adjusted wood louvres, perhaps even the new rack and stands, there is better tonal balance, and no emphasis of one frequency over another.
I thought I had gotten it pretty close, but David simply took it a bit further. The sound is more complete, and I must really reiterate, that it is more natural. Sorry, but it seems simply the best way to describe it.