Panasonic SA-HT880 Home Cinema "hum"



When I turn up the volume on the receiver from zero,an audible hum can be heard from the surround sound speakers.

The hum doesn't get louder as the volume is turned up

The corner in which the system is sited is very busy with cables to the Sky HD box,TV,HDD recorder,VCR,and Xbox 360

Is it possible the system is picking up transients from the surrounding cables?


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