@wsrrsw
I find it hard to take seroiuly folks who haven’t tried equipment they excoriate but haven’t used or been around. Ah the internet.
Well that's good news because In the video, they compared the AQVOX vs. the standard D-Link switch with blind listening tests. Out of two rounds of testing with 10 participants, the AQVOX was selected as the better sounding option once, the standard D-Link switch was selected 4 times, and the rest of the times there was no difference heard. You watched the video, right?
There's no reason why a network switch whose only purpose is to move data without error from point A to point B should change the sound. This is the beauty of digital data. No matter how many times data is moved through the switch, a perfect copy is made on the receiving end. This is fundamental to how digital audio and systems (i.e. PCs, streamers, the internet, etc.) work. Otherwise, none of these things would be usable.
So with that fact in mind, the only way the sound would be different is if somehow the data payload bits were being changed by the switch. That means if you copied a file from one device to another using that switch, it would be different on the receiving end. You can test this yourself with tools built into all the major operating systems in use today. No measurements needed.
Try it with your JCAT switch vs. a normal switch (perhaps on the cable modem or wi-fi router supplied by your ISP).