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I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.
If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.
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https://www.youtube.com/watch?v=RH78q36liks
Apr 15, 2014 - Uploaded by Above Ground Pros
Above Ground Pool Pump Won't Start or is Humming & How to Fix It ... Pool Motor - Humming-Loud Noise ...
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https://www.youtube.com/watch?v=3v2v6aDDq9A
Mar 25, 2013 - Uploaded by James Hayward
Do you have a pool pump not priming (pumping water) andmaking a humming noise ... not only give a ...
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Switch on your amp, keep its volue down to extreme low, and listen if there is still hum through the left channel or not. If still there is hum, the left side power amplifier section inside the amp;ifier is faulty. If htere is no hum at this state, hum enters thorugh the audio input terminal, and the input wires must be checked for open sheild connection. OK.
Subwoofers are basically a mono amp. If you have replaced most of the big caps on it then I would go for the main amp device, the bit that does most of the work.
Usual cause of mike hum is poor earth of screen in cable. Check connections between cable and earth pin or shell of plug. Don't make earth connections at both ends of cable as this will create a loop areal and pick up electrical noise.
You might also want to check for poor amp earthing. Normally moving close to, or touching, the front panel will reveal this problem as hum will reduce dramatically.
your mixer should be grounded by the power cord, and the decks have a seperate ground wire which connects, usually on a screw terminal, to the mixer, which provides the ground for the decks. I would try the headshells to make sure they are tight and connected correctly also make sure the power socket on the wall is earthed properly.
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