Anacablethatcantbediscussedhere
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Do give it about 6 to 8 weeks before tweaking elsewhere to get tonal balance optimal, for now is my advice. The DR supplies I find start from new with Bass-end very good and almost ‘done’ run-in but the top-end goes low-detail and can sound shut-in for a bit until run-in and that makes the whole sound bass-heavy with detail rendered - the ‘subjective’ frequency response and not any actual one measured with sine waves and the like.
Once the DR supply HF caps run-in then it opens-out nicely and it should then be fine. The non-DR supply runs-in ‘opposite’, in that the bass takes time to fill-out and lags the rest.
The DR very low bass also fills-out later and the end result is a seamless presentation when the DR supply is offering a more linear impedance to the supplied load (ND555) and it all just runs nicer to listen to after a few weeks from new.
Just how I hear it and not meant to be other than one experience of these things. 
DB.
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…you mean ‘futile’ surely?
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That as well!!!.. ha ha 
I am in exactly the same place. The sound is a bit « round »… as if the top end now needs to extend a bit to catch up with the extra bass and mid.
As I’ve said before, I had a very extended trial of a well run in PS, and with that the whole presentation improved top to bottom, so just a waiting game to get there I guess 
Good to have your feedback…yeah I expected the run in to be protracted…but I did wonder if the digital side would be so sensitive…the answer is obviously yes it is…just hunkering in for the long haul now…
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I noticed exactly the same with my CD555. I bought a second 555PS to partner my NDX2, but tried it on the CD555 as an experiment. It hasn’t gone back on the NDX2
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Hi all good news … bizarrely things are beggining to snap in space … the sense of space and air…is getting better and better…the speed of percussion has also increased leading edges are very very good. On the other hand I am getting a sense of relaxation to the presentation… especially to complex music passages…which are really opening up… Bass is tighter and deeper…all good now let’s hope it continues…
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Similar experience here - all started to snap into place on Saturday evening, which is a week into burn in. Now sounding very balanced, bass lines are laid bare, beautiful mid and a sweeter, more open top end. All good 
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On this journey a couple of things have really surprised me…
- The ND555 sounds really great with one psu … and you think how could it be any better…as nothing is apparently wrong…but the second supply really does for me have quiet a profound effect. The same happened with the 272 … adding the 555ps was phenomenal…yet it did not sound broken before… amazing.
- Just how good the 552 preamp amp is … it is very fast and very transparent for an old timer…
- These little PMC speakers are just incredible … these little chaps are so transparent, clear, focused, snappy and yes they are digging out some amazing bass…perfect for a small room. I will also add they are in no way embarrassed or exposed by the front end … they are a brilliant design.
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And it just keeps getting better! Separation of instruments is just on another level. I am hearing stuff that was always there, but just sort of blended into the mix. Now every instrument exists in its own space, if that makes sense.
I am wondering how it can get better, but apparently the journey will continue for a few weeks yet
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Very well put Robbo … here here … 
I think the ND555 is phenomenal and really it does deserve the two supplies … I am listening to all sorts… particularly enjoying ECM albums…I have a couple of tracks I occasionally reality check with … as I am used to sonic landscape. All I can say is wow I am hearing elements in these tracks that were not there before … in a way the system is seeming to behave like its being supplied by a phenomenal analogue - source… if that makes sense…
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Just listening to the MQA test on Roon Live Radio … wow that sounds terrific… give it a try…
Have you read the review ?
İt is little like a Commercial:)
A third 555ps will bring musician home 
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I expect a 888ps…
I had a thought last night … what if you had one big box … say the size of a Krell KSA and then had every single supply cable with its own dedicated DR psu and individual transformer and smoothing capacitors for every single supply cable…(as I am not sure 2 x 555 supplies cover the each entire supply cable…(I think some are grouped correct me if I am wrong) … 
Well the Hi-Fi+ review is in - you can read it in full here. Summary = “Naim has done it again”.
https://www.naimaudio.com/sites/default/files/HIFI%2B%20November%205%202020%20-%20ND555%20double%20barrelled%20review.pdf
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