Is it a humming noise maybe?
Some sort of ground loop?
Have you tried to turn one of the power plugs 180°? (if this can be done with your socket and plug, we can do that in Germany)
Otherwise you may be able to have a "ground lift" of sorts.


“Musicians”: UltraPak 2025
DAW: Studio One Pro +
"Instruments": VSTs and REs
Notation: Notion 6
Interface: NI Komplete Audio 6
Mic: RØDE NT1-A
Controller: Panorama P6/KAWAI VPC1/Atom
OS: Win 10 64 Pro