Question Focal Dome hum. Goes away when I touch phono input & body

Richard Harnwell

Active Member
The sub in my 5.1 Focal Dome system has recently started to hum, even when not connected to a receiver (not even a lead plugged in). It increases with the volume knob.

I’ve tried different mains leads but no difference (I notice it has no earth/ground. I’ve tried it via other mains sockets and no change.

If I touch the outside of the RCA socket it mostly goes away. If I additionally touch the body of the sub, it completely goes away. Can anyone suggest what this signifies, and how I might fix it?
 

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