I think it is probably from the GPU. I dont know much about computers these days, but it’s my understanding that it has a high quality power supply. Thats not exactly proof of anything though.
I did not have a PC in the setup before this.
The noise I am hearing is a clicking that changes frequency as the computer does things. (Maybe that helps)
The noise is heard through the subwoofers which is powered by a Crown amp. The RCA wires running to the amp are 35′ each. (Potential source)
I have a simple analog multimeter. No oscilloscope, ground lift adapter or outlet tester.
My plan for today and tomorrow is to: run speaker wires in place of the 35′ RCA cables which would permanently place the Crown on the same plug as everything else and bring the RCA cables down to 4′ total. I will be testing more configurations with the isolation transformer. At the moment it is plugged into a different plug than everything else. I plan to clean up and consolidate all theater equipment onto the one plug. I also ordered a crap-ton of Ferrite sound suppressors. Or Ferrite Beads. $20 got me 40 of them on amazon. Im not 1000% sure the propper way to use them with different wires/sources etc so I will try to do a bit of research beforehand. I will also do my best to seperate steps and judge results as I go.
Very greatfull for the help!