I suspect OP means "motorboating" which admittedly is a form of torture to the ears. I experienced this once and it was due to my router being in close proximity to toroidal transformers. Problem instantly solved when I moved the router about 8 feet from the rack.
How to stop waterboarding
Account my sound room which is all on one line(no other way to hook it up) I have waterboarding issues through my speakers.(constant low bass pulses). Is there a power conditioner that would achieve continuous 117 volt output- I would hook my preamp only to this. I’m hoping this would stop the waterboarding issue.