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60 Hz Hum from Powered Sub

Hi All-=

I have an older (late 90's?) Tannoy PS110 powered subwoofer. It has a 3-prong (grounded) permanently connected power cable. Over the last month it has developed a 60 Hz hum. I've plugged it in different locations in the house to rule out ground loop. The hum is present whether there is an audio source connected or not. Is it time to just move on or is this something worth repairing? Could this be something simple, and if so, how can I diagnose it? Any suggestions are appreciated!

Thanks, 

G
spacecadet65

Showing 1 response by cleeds

cleeds
6,087 posts
 
oldhvymec
... A common and a ground CAN (not should) share the same bus with a jumper in the main. I keep them separate. That jumper can be the source of a lot of noise in house wiring ...
It isn't clear what you're saying here. All neutrals and grounds must be bonded together at the main panel - and only at the main panel - for safety. That is very a basic NEC requirement. No exceptions.
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