I am getting a “pulsing” or “beating” sound in my headphones along with some static. The setup is a Naim Uniti Nova into Focal Clear Mg headphones. I cannot reproduce this sound through my speakers. Dead quiet even when I turn the volume to 100. My very rough guesstimate trying to count the number of beats is around 400/min. (I am in the US - 60 Hz power)
It occurs regardless of whether any source is playing. I have tested:
multiple inputs (Roon streaming via ethernet, turntable and tape into the two RCA inputs, playing radio stations through the Naim app_
I varied the ground switch between the floating and default setting
I have the unit plugged into a surge protector - I moved it direct to the outlet and also moved it to a different outlet on a different circuit breaker.
Any ideas of potential sources or corrective action would be appreciated.
There is a wireless router not far away as that is what the Naim is plugged into for streaming. I will be hooking it up via backhaul but will not be able to do that for about a month. I will still disconnect it later and see if that removes the noise as it occurs even with no inputs. Good idea.