I had a weird static noise coming through my speakers and discovered two things contributing to noise. Ethernet cabling near speaker wires and I also had to move e my ethernet switch away from my tube preamp. Amp is tube.
In my last house I had a Glade Plug In air freshener causing noise. Whenever it released its scent I got a crackling noise through speakers. Wasn't even on the same circuit. Unplug any stuff like that while troubleshooting