It all depends on what your expectations are, the sound quality you expect and how well you hear.
But… if one seeks the best possible sound: bit perfect out of WiiM to external DAC and from there to an analog preamp with a top notch volume control (ladder resistor best). And of course it all depends on the quality of those components in the audio pipeline. But… if all is right…
This is my reply to the OP who labeled the post -
Best sound from the Ultra.