With the ndac, the quality of the device feeding the Ndac is more important than the power supply. Good quality transport/Ndac/No power supply is better than poor quality transport/ndac/power supply.
I use a Primare NP5 Mk2 streaming bridge to feed my Ndac. It’s detailed, refined and definitely isn’t fatiguing. It seems to be a good match for all Naim dacs.
It’s a bargain at £500 plus £100 for ifi power supply.
People under estimate the importance of a streaming bridge when it comes sound signature.
I posted the following on thread a few weeks ago discussing streaming transports for the NDS, which is very similar to the nDac.