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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 ja_kub_sz

ja_kub_sz's avatar
ja_kub_sz
275 posts
 
Funny, I was using my sub's Line Input/LFE connection via RCA cable from my loop out right/left connections on my power amplifier and all was well.

Now using the high level speaker input connection with the amps plug adaptor off my speaker terminals and I get the 60Hz hum.

Need to mess around with it more, but why would the power amp to the LFE be fine, but not the high level speaker terminals (producing hum)?
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