Hi Malcy, there is no right answer to your question, just whatever sounds right to you in your environment. However I feel the forum logic will suggest the HiCap will be best served on the amp. When I previously owned a CD5x I found the perfect power supply was the Flatcap 2x and that a HiCap made the 5x sound frenetic and as if it was on steroids, very overblown. I feel that putting the HiCap on the Nait will help keep the system balanced. Hope that helps.
Kind of interesting in a way, flies in the face of source first as far as enhancements/upgrades. I have typically found that the XS Series in general seems to sound best by themselves with no add-on power supplies, seems the music just flows better and has that certain “rightness” to it. Then again, it is all what the beholders ears hear, no right, no wrong here. Enjoy the music!
That’s a comment made about the flatcap quite a bit. Imagine the same components squished into a hicap case, and it doesn’t seem so bad though. Imagine a flatcap as a hicap lite, but with better component separation!?