Hi @razzzor1963 I used the SXPS Burndy too with nDAC and 555PSDR. I sold nDAC and now use the NDX2 with 555PSDR using the same Burndy cable - it connects fine. My dealer gave me a useful tip when connecting the Burndy - each Burndy connector end has a series of ridges visible in the inner black ring - the widest (or thicker) ridge should always be in the 12 o’clock position (at the top) as you line it up to connect it. The labelled end of the cable should go to NDX2 (as source).
Razor, the S-XPS Burndy should work fine - are you saying you can’t get it to fit, or that once all hooked up (remember to unplug the mains lead from the NDX2) that it doesn’t work?
I had both the XPS and the mains lead connected to the NDX 2, and I was getting the power button on the NDX 2 blinking in a series of three (blink, blink, blink, pause…).
I have powered everything down and disconnected the mains lead. Now only the XPS power supply powers the NDX 2.