So this is a somewhat odd thread but I’ll add to the pile. Noise is an issue that is hard to fathom as when it’s there, you may not realize it. When it’s reduced you certainly can.
Had used the fiber optical solution seen here in the video and it worked very well. When I added a WiiM Pro to my monoblock tube amps, didn’t think it was needed anymore.
More recently, I had switched going out from the streamer coax and thought let’s try that glass optical cable I run for video audio. It is a substantial and a lovely improvement running that glass Toslink into an RME ADI-2 DAC. The DAC can handle 192K streaming coming out of the WiiM Pro.
Had the fiber optical cable lying around and said, hey, why not give it a try. It may not be an improvement like earlier. (Also use an LPS for the second fiber converter's power and to power the WiiM Pro.) Well, it took up the performance a whole other notch and now my system is the best sounding it’s ever been. It's sooooo good. 🐸
Both of these changes offered significant improvement because noise was removed. They are both audible and with noticeable impact. Happy listening and Happy New Year!