The NDAC was a popular upgrade for Naim streamers as an alternative to a PSU upgrade. Then there are PSU upgrade options for the NDAC, and here the consensus seems to be that the original non-DR version of the 555PS is the best match.
Many of us chose Chord DACs paired with Naim streamers, but of course, there are many others you could try.
The Ndac , even without ps, will uplift nicely your Nd5xs2. No problem.
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I certainly wouldnāt call it a consensus, rather a certain number of opinions.
There are numerous opinions in favor of the he 555PS-DR as well.
As far as Iām concerned, the 555PS-DR was an obvious choice considering what the DR technology brings to the table in terms of lower noise floor, and therefore clarity (especially for voices, acoustic music andā¦ piano!)
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I certainly wouldnāt state a sharp opinion regarding the ND5 XS 2 and the nDAC.
I havenāt compared them side by side.
I did compare the nDAC against the nDAC+555PS-DR and then against the ND555.
Even Though they share the same DAC chip, the jump from nDAC to the ND555 is quite something!
As for adding a power supply to the nDAC, the 555PS-DR made a significant difference, by lowering noise floor and allowing clarity and those microdynamics that give the illusion of the real thing.
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Thanks for your comments,
I estimate that in the near future, I will be able to perform, with the kind help of my dealer, a hearing test with Ndac + 555ps paired with 5XS2.
I guess you will read about my insights in the near future. 
If you can afford Ndac/ 555ps/ Nd5xs2, I would personally better go for Nds/555 ps, which will sound better, at least for most.
But you will not have Qobuz native.
If Qobuz native is a priority, better buy Ndx2/ Xps dr for similar global cost.
All depends if you have already or not the Nd5xs2.
I agree with Chrissu, the majority prefer 555 ps to 555 dr for Ndac, on this forum.
For all Naim streamers, the dr is however better.
Interesting.
I already have the 5 XS2.
I am interested in the analog enhancement beyond the advantage of the existing digital platform in the 5 XS2.
Iām not willing to give up streaming quality (TIDAL MASTER and FLAC quality internet radio) in favor of improving the analog port on a previous generation device (NDS).
I therefore assumed that combining the Ndac with the 555, would be a perfect and inexpensive solution, as opposed to purchasing a new streamer and a new power supply.
(I am not interested in the Qobuz server and I am very pleased with the existing server.)
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As you are not interested by Qobuz, an Nds/555 dr would be the best sounding option. Around 2/3 k for the Nds actually, a real bargain.
So if you sell your Nd5xs2, it will pay you the Nds. You will just have to buy a second hand 555 dr, serviced not more than 4/5 years.
Or buy, as you said, an Ndac/ 555 ps .
Globally both options cost nearly the same. But you know already my preference 
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I have yet to come across anyone, on this forum or elsewhere, who has said that they prefer their NDAC powered by a 555DR. Where anyone has expressed an opinion, it has invariably been for the non-DR version for this perticular pairing.
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Really? If I recall correctly I did
My findings are pretty much the ones describe by @Darkebear on the following post :
ā> Naim PS555 dr against old PS555
the 555PS non-DR being somewhat veiled and lacking some precision.
Did you compare them yourself?
But of course, everyone has its own taste and expectations.
Given the benefits of DR technology I struggle to see how this isnāt a step up over the non-DR version - at least to some ears. It certainly has proved to be in my experience on a CDX2 and a CD555. Admittedly I havenāt compared them on a NDAC but Iām sceptical that thereās something unique about the NDAC that makes it function ābetterā with a less capable power supply.
Taste I suppose. Nothing wrong about that, of course.
Itās not a comparison between dr and non dr 555ps, but between Ndac/ 555ps and Ndac/555dr. The non dr gives apparently a more natural and musical sound on the NDAC.
Dark Bear refers to the Nd555.
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