I hearing a continuous fairly high pitched buzzing noise from my speakers as soon as I plug in my M-audio 2x2m audio interface into my computer.
This is my setup: Computer -> M-audio 2x2m (interfaces and draws power via USB C) -> Line out (Left & Right) -> SBX 10 Subwoofer (TRS Input, Left & Right) -> TRS output into XLR input of speakers -> Genelec Active monitor speakers.
I've tried switching out my power bar for a surge protector one (grounded of course), tried different high-end cables (thinking it was EMI), etc. Recently I've noticed that the buzzing is more intense when my GPU is working harder, hence I think that it's probably some kind of EMI going on inside of my computer.
Might also be worth pointing out that when disconnecting the audio interface from the usb and powering via a power bar makes the noise go away. Turning the computer off while still using the usb port eliminates the noise as well (the usb ports still supplies power when the computer is turned off).
As a non-electro engineer I've ran out of ideas on how to fix this.
Is there a device out there that can be used as a filter for either my TRS cables or USB-C to eliminate this noise? Or does anyone have any other clue on how to eliminate this?