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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.
Disconnect the input and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
try taking out the capacitor and wire the amp up with out it. it sounds like the cap is back feeding or discharging voltage when it should not be . if you reinstall the amp with out the cap and noise goes away buy a new cap or do away with it .
There is a problem with the amplifier within the sub. Many of these units never completely turn off. They are often set to automatically startup when a signal is detected. This may be the case here. The loud hum as a defect in the output amp section. At this point you probably have a blown amp section. The "protection" for this is to cause a dead short that will open up the fuse. This unit will require service. It is unlikely that any service info is availabel to the general public either.
The fix could be simple, but without seeing the unit, I can not state that for sure.
Turn on your bose so you can hear it hum. Go to the back of your cable box and remove the co ax cable connected to "cable in". If the humming stops, the sheilding on your cable is no longer grounded. Purchase MPAV800 or similar surge protector to run cable line through it and get it grounded.
Sounds like an inadequate ground wire in the signal cable. You may have to replace the cable between the reciever and bass module. It also, however, may be IN the bass or reciever module.
IF YOU HAVE THE SAME AMOUNT OF CABLES AS SPEAKERS HOOK THESE UP TO YOUR AMP THEN SUB TO SUB OUT PUT ON YOUR AMP WITH A SUB CABLE OR PHONO THAT REACHES FROM AMP TO SUB.SET AMP TO ALL CHANNEL STEREO OR MODE THAT SENDS STEREO TO ALL SPEAKERS,ALSO SET SPEAKER SIZE IN SETUP OF AMP TO SMALL AND SUB OUT PUT TO SUB ONLY.YOU SHOULD GET MUSIC AROUND THE HOUSE.IF SOUND IN SAY BEDROOM IS NOT AS LOUD AS BATHROOM USE THE TEST TONE TO LEVEL OUT EACH SPEAKER.
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