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move ur speakers around. if the noise is absent on some places u can be sure its the digital box. or one fix that might work is - get aluminium foils and wrap ur speakers. this can blank out interferences. if that works, open ur speakers and line the walls with thick aluminium foils. hope this helps.
Disconnect the device (amp or TV) that is feeding the speaker system. Turn on the power and see if there is still a hum. If the hum is no longer present, then the hum is most likely from the source.
If the hum persists, most likely the power supply has failed, or the output section has a short. You should contact the manufacture for support. They will most likely recomend that you give the unit in for service.
I was moving around my large woofer speaker last night and then all of a sudden the unit went into protection mode. I tried all the various solutions posted on here and nothing worked. Then I went back to my speaker connections on the woofer and unplugged them and plugged them in again and it seems to be ok now. Very annoying problem. Can I suggest unplugging all the speaker cables and replugging them back in. Also another solution may have been holding down the power button when powering up the unit. Give all the above a try.