People here on ASR will let you know the WiiM Ultra’s onboard DAC and analog output implementation measure transparently well enough that you will not hear a difference with an exterior DAC that also measures transparently well and is level-matched.I have a Wiim Ultra paired with my Onkyo TX-8150 receiver with RCA and Monitor Audio Silver 1 speakers.
Is there any point in buying an external dac for the Wiim ultra for better sound quality?
-Ed