I realize this is a conversation from a couple if years ago, however, I just read it for the first time recently and decided to see if some if the advice contained within would help my system and I can say that it most certainly did.
My WiFi modem/router is still close to my system rack, but I moved its power cord and also a couple of other various switching power supplies for the cooling fan, Roku and Aptx Bluetooth receiver I use when I am looking for something new to add to my Tidal playlist to a separate power conditioner I had and plugged it into a separate outlet and I am very, very pleased with the results.
I may try an isolation transformer later but I am really enjoying this essentially free improvement.
My WiFi modem/router is still close to my system rack, but I moved its power cord and also a couple of other various switching power supplies for the cooling fan, Roku and Aptx Bluetooth receiver I use when I am looking for something new to add to my Tidal playlist to a separate power conditioner I had and plugged it into a separate outlet and I am very, very pleased with the results.
I may try an isolation transformer later but I am really enjoying this essentially free improvement.