The NDX-2 has been continuously running for 2 days now and is starting to "open up". It's the first time I actually notice myself what running-in does to a system. The difference compared to two days ago is very big. The NDX-2 is very, very good and exceeds my expectations.
The first thing that is quite a difference towards the NDX I had, is the speed of everything. There is more dynamics and the music is really separated/loose from the loudspeakers. In general I also have the impression that everything is closer to me, like if the soundstage comes a few yards closer.
Second the NDX-2 is really "in the face". It immediately grabs you by the throat and makes you almost part of the music. I know that sounds strange, but it really does. You really feel the atmosphere of the sound stage or studio where the recording was done. Very nice. Dynamics are so much better; stronger and clearer defined. The level of detail grew significantly when comparing my previous NDX/XPSDr combo.
Third is that imaging and 3D is further evolved and refined. Separating instruments and voices and understanding who/what is in front or not, is automatically there and doesn't even require intense listening to notice.
Downsides? Oh yes; even more than the NDX, the NDX-2 highlights bad recordings pretty significant as bad recordings. Next I notice a sense of harshness in some high frequency tones but I think it is due to the Beryllium tweeter of my Kanta 2 speakers since also the NDX had this a bit. It is not much, but it is there.
Would I do the investment again? Yes I would: the NDX-2 for me is a superb addition in my set which I feel is pretty balanced now. It brings the overall quality and experience to a higher level. This does not say anything about the ND5XS or NDX (I had them both) which are very good pieces off equipment, but the NDX-2 just very clearly shows how also audio-development can evolve.
I never had a NDS at home and only heart it at audio shows, but I dare to say that the NDX-2 is close if not on par.
At the moment I do not have my NDX anymore, but I was able to directly compare the XPSDr/NDX versus XPSDr/NDX-2 combination directly the very first day (when the NDX-2 wasn't run-in at all). It is especially the speed and detail that improved and makes the combo even more mature