Guinnless, thank you for your suggestion regarding the HiLine.
I moved it from the NAP 200 (non-DR) to the HiCap DR, and, in my room, with the type of music I listen to, it added too much presence in the midrange for my liking.
Since I had the HiLine unplugged, I thought I would try it on the XPS (non-DR) connected to my nDAC. Wow! I really like what I am hearing. The HiLine on the XPS offers even more depth and insight into the music, and it offers more air around instruments.
If you are satisfied with the sound quality of your system and you are looking for a transport that can act as a Roon endpoint, as a first step I would replace the NDX with a DigiOne Signature.
This would give you (among others) a high quality Roon endpoint with a S/PDIF BNC output that you can directly connect to the nDAC via DC-1.
I agree with the NDAC/xps2 being very capable. The area I would focus on is the streamer. The NDX and NDS are capable but quite long in the tooth now and very much surpassed by their next generation streamers … in fact the NDX and NDS sound and feel crude in comparison… no doubt it’s all that electrical noise which Naim have largely tamed in their redesigns and was holding back the first gen products.
So I would be tempted to get a ND5XS2… state of the art Naim transport with many of their latest developments, Roon end point… no display and a price that is attractive.
Analogue output wise it’s top notch too, but different from the NDAC/XPS2… so you can still retain that as an option driven by the ND5XS2… and if you prefer the streamer sound you can then later sell the NDAC and possibly XPS2 as the ND5XS2 is optimised to and can only work from a single PSU, it’s own… so you have options… and possibly the funds to upgrade to a used 282 driven by that HiCapDR.
Your music enjoyment should take a big step forward, I can’t over state how much better the new streamers are compared to the old in terms of versatility, refinement and audio performance.