I just thought of a mechanism by which different switches could effect audio quality:

- If one switch's power supply is injecting more noise back into the residence's electrical circuits, it's possible that the noise impacts the audio components.

That said, this would be trivial to address with a simple ferrite core on the power cord of the switch. 2$ U.S. and the problem goes away. Nothing fancier needed since we are not concerned with filtering the power to the switch, only filtering the high frequency coming back out of its power supply.

Living room: 818v3, Parasound A23+, Maggie 1.6
A/V room: 861v8, DSP7200SE L/R/C, 4x DSP320 surrounds, ID41 + Roon, UHD722, Prime+PS