I'm assuming you are talking about a hum that is heard when nothing is playing....the sytem is turned on but that's it? Correct?
You will hear something in this case, but then that is not abnormal. The degree of noise is something I can't ascertain not being there, but I also know I wouldn't have my ear glued to the speaker.
If it's an audible noise from a regular seating position I'd say you have something to worry about or investigate.
Give us a few more precise details as to how and when and under what circunstances you are hearing this hum.
John
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