Jea48
This is a really awesome explanation thank you very much.
I guess a Cable connected between two components that happen to be plugged into different circuits effectively creates a bridge of power between the two phases, although add to a very low Energy level. The components are likely designed in such a way to avoid impact due to this bridge.
Existence of the bridge nevertheless is a source of interference because there is some communication between the two components of electricity flow which causes noise?
Even if you use the same Circuit for connecting components and mixing outlets you still run the risk of creating hUms because use of different outlets causes ground loop issues because grounding is now shared between two outlets which is not healthy and creates an antenna along the grounding path. Does all this make sense?