Measurements seem to indicate that this device works fine with an external DAC. Well, to me, the Arylic mini analog out also sounds great...... At normal volume, THD is like 0.1%, so to me it seems plausible that this is compatible with "sounding great". Great speakers exhibit higher levels.
The WiiM players use linkplay modules as well. The apps work cross-brand. Arylic, WiiM, Pro audio, Dayton, and there are many more. I have a low-end nedis as well. Measurements indicate that the WiiM equipment also measures up against the criteria of ASR users. Well, not sure if that is needed for the entertainment part ;-) Oops, not intending a fight here, just reflecting what is needed to get that quality for entertainment. In the end, I would be highly interested in real data, double-blind tested, on how various factors contribute. Is it THD? DAC jitter? Or more likely IMD and class AB cross-over distortion? Some amplifiers are susceptible to funny cross-over networks in speakers. Again, one of the reasons why class-D amplifiers are so great, not sensitive to loads. And almost no IMD.