@jamesjames I also have an SA-10. Headphone amp is a Lehmann Audio Linear SE. I also have an HD 800 and all I can say is that in general my findings of the NDH 30 are very much in line with
@chesebert. I don’t generally listen to classical music (despite being a classically trained professional musician) and I can agree that the HD 800(S) might well be preferable for large orchestral works, but I’m also of the opinion that their tonality is not as natural or correct as the NDH 30 and their ability to reproduce intimate recordings is poor due to their ever-present expansive sound stage.
I find it very easy to understand why and how someone could think that the HD 800(S) was better than the NDH 30, but for me the NDH 30 is a better overall headphone in terms of tonality (timbre) overall frequency response (much better and more extended bass and more natural treble response) and general flexibility in terms of correctly representing what’s on a recording - they really seem to adapt and sound like what’s on the recording, as opposed to having their own sound. This may well come across as unimpressive to some, especially if they are used to something like the HD800(S).
I will note as a point of reference to my comments about tonality and timbre in particular that although I greatly enjoy my involvement here I primarily listen on full size monitors (speakers), and I’m fortunate to have some ATC SCM100ASL. I normally listen to CD or SACD. Pre amp is a Mark Levinson 38. All I can say is that the NDH 30 bring me far closer to the sound of that system than the HD 800 does.
I’m not trying to prove anything about the NDH 30 here - opinions will forever remain subjective - I just say this (some of which I’ve said much earlier in the thread) as a reference for my own perceptions and opinions.