To my ears it is an excellent implementation of the Burr Brown chipset, and can be improved even further with a power supply. I have not heard that cd transport, but the NDX2 is unlikely to be a limiting factor.
should I swap for a NDX2 in future, what about using the CDX2 as transport only (digitally connected to NDX2 internal DAC) and move the XPSDR from the latter to NDX2? would it be a general improvement for both sources?
Be mindful of the signal earth if you try this and set the streamer to chassis if the CD player is feeding digits to the ND it will no longer be performing this function. I assume you have the ND5 set to floating at the moment.
There should be only one signal earth in a Naim system. Their CD players provide this and there’s no choice in this case, the streamers and DAC allow you to select whether they do this or not by a slider switch on the back in case you also use a CD player.
For some reason they changed the label on the latest series of streamers so it now gives a choice involving default and floating rather than chassis and floating but if all you can see when peering behind it is default than you have to refer to the product page to see whether the alternative is chassis or floating it doesn’t say in the quick start guide and there’s no proper manual, just a rather confusing online menu driven alternative hidden under support rather than manuals and downloads but that’s progress for you.
that was indeed what I found on ND5 XS2 support page, as previously mentioned: “Select the default position unless the product is connected in a hi-fi system incorporating another earthed source component, or mains ‘hum’ is audible through the loudspeakers”.