@ozzy
I also have an ethernet cable out from the EtherRegen that is running to my Apple TV, so, I placed the 2nd SmoothLan before that Apple TV.
I think with this connection I am getting more additional "digititis" removed and it is improving the picture quality and... there also seems to an improvement further in my audio streaming sound.
But I’m not sure how this is possible yet. Any ideas?
The Apple TV device (or its SMPS) has noise, which rides back into the switch your streamer is connected to. The 2nd SmoothLAN isolates/removes this noise, improving the audio even though the streamer is not in the direct signal path.
I too found a nice picture improvement using SmoothLAN on my LG OLED. A slight reduction in grain and noise you never knew was there.