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CHECK THE ALL THE CABLES (RCA) .
i think missing ground sheeld .
or smoothing capacitors are leak.or power output section faulty.
can you poen the cover and check circuit board get wet anyhow,
nuwan
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If the hum is from line pickup, it should be 60hz or 120hz. If you are connecting to a line powered device, you might want to try a direct or isolation box. There's a ton of them like these Passive Direct Boxes
And see if orienting the mic at a different angle. Try turning off fluorescent lights. Isolate ie as much as possible.
Does the subwoofer have the same hum when the input cables have been unplugged? Many input cables use very fine conductors, which often fail. A bad cable will often introduce a hum and prevent a signal from getting through. If the noise is still present without the input cable(s) connected, then repair options are limited. No schematics are available. There's a daughterboard that has been available, but its failure usually causes the system to die (short-circuit). The cost to repair the amplifier may be close to the cost to replace the entire sub.
Usually a faulty cable or blown speaker will cause a humming. If it is a constant humming I would surmise a faulty cable. On the other hand, if the humming comes and goes I would guess a faulty speaker.
It sounds like you might have a grounding issue. Try connecting to the wall outlet with a ground prong lifting adapter. Not just the speakers but the source plugged into the speakers also.
Good luck.
Hums come from several sources. A light dimmer switch on the wall. Speakers too close to a monitor or other electrical device. Try turning off everything in the room or nearby rooms, one at a time while the hum is audible.
Sounds like you have a bad connection somewhere. Make sure all of your connections are secure. If theres anything that is a little loose you'll get that hum. You might also try replacing your cable too. If it became pinched somewhere it could cause that problem
i have solved thsi problem. The reseller suggested that probably a earthconnection was demaged and indeed that was the problem. by heating the earthconnections, specially the wired ones this problem disappeared.
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