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Hi. Regarding your issue, there might be a problem with the cable or the jack coming from the speaker itself. Better to have the speaker checked to its manufacturer, or have it replaced for you not to hear any annoying noise no more.
The hum (50 or 60 Hz) is caused by the AC power getting into the entry point of the amplifier. Either the filtering capacitors from the powersource of the speakers have dried up - replace them - or there is a short in the cables. There is another possibility: if you have kicked the subwoofer box its transformer might have slipped from its fixings and now is touching the subwoofer speaker frame.
The only way to find which is to open the cases.
If they are computer speakers try this: (remember i am doing this from a windows vista) on the bottom right hand of the screen there should be a volume key right click on it and click on playback devices then right click on your speakers and click properties and go to levels and turn down the volume from there and see does that work... hope this helps.
speaker amplifier chip may leaky or damage
you are using improper sound driver
check driver status in your computer device manager or just typing dxdiag on run in start menu, check status of sound driver installation