Interesting.
Thank you for the great measurement job you have done for the WiiM units so far.
Can you please show measurements that can back up any noise coming from the spdif coaxial output ? Anyway, using toslink out there is 0% noise ? Does a better powersupply for the WiiM, like Sbooster, make it measure better from the coaxial spdif output ? We are a couple of 1000 audiophiles that wants to know.
If one uses a separate Dac to the WiiM with an input transformer at the coaxial spdif input, there is for sure galvanic separation = no noise ? Like in this Rega Dac R :
View attachment 325115
( I think that for sound quality there is much more impact than noise, if the spdif output signal are free from any sample rate conversion. )
This is measurements with an eye-pattern from stereophile regarding the toslink output from WiiM mini :
View attachment 325112
”The WiiM Mini's TosLink output was bit-accurate. I examined the amount of timing uncertainty—jitter—in the TosLink output using my Audio Precision SYS2722 system's digital oscilloscope function. I overlaid successive snapshots of the Mini's digital output, taken over a 60s time window, to show what's called an "eye pattern." All the pulse transitions in the datastream should overlay one another to produce an image of a wide-open "eye," with just one trace visible. This was the case with the Mini (fig.12) with the original 44.1kHz data plotted over one "unit cycle." The eye is wide open, with no blurring of the leading and trailing edges”
My comments to onlyoneme : Is there a reason to believe that the WiiM pro behaves differently ( worse ) than the mini from its digital outputs ?