Sorry couldn’t figure out how to PM you back
From what I understand there should be a big step up from a 272 to an NDS.
It would certainly be a better DAC than in the ND5XS2 (I had a ND5XS with NP5XS before the NDS, and also used the NP5XS to power the NDS before the 555DR).
Now the nDAC is meant to be good, especially with a 555DR, but again it is using both A & B feeds? Only the NDS and ND555 have the double Burndy feed from the 555 PS.
Plus from Roon what are you going to feed it with, a S/PDIF feed is flawed, and no USB input.
In my book it is either NDS/555DR or ND555/DR or dCS, Meridian UltraDAC
So, if you are going Roon, i.e. with the Roon Core, Subscription how best to realise it without going to a ND555 with the 555DR?
The cheapest option is the dedicated unit for the SonoreUPnP Bridge, and house with the Roon Core, or a SonicTransporter which can run Roon Core & the SonoreUPnP Bridge on the device.
Then after than is a more expensive platform for the networking. Yes you could go optical with an oR from your Cisco, or Cisco to an ER via optical then NDS. All good options.
But it depends on where you are storing music library, and what plans for that.
I do believe that a Roonified NDS with the SonoreUPnP Bridge with good networking implemented would give the ND555 using native Roon a good run. Naim don’t demo the ND555 being used with Roon, focusing on a unit driven over UPnP from a UnitiCore server, as they use to the NDS, i.e. WAV on the Ethernet input, minimal CPU processing and therefore current draw from the 555DR PSU.
This is the configuration I have for the NDS, the Roon feed presents as a WAV UPnP feed to the Ethernet port, feed from the dedicated isolated ‘B’ port of the EtherREGEN.
I get all formats supported by Roon, MQA unfold for Tidal Masters, Roon Internet Radio (the latest release only threw 320k AAC at the classic devices, but with Roon FLAC streaming has been live since last year), plus all the Metadata enrichment, better Artwork presentation etc.
So let me know what you think of the current units on demo.