SOURCE: Loud humming coming from subwoofer
This can be caused due to an increase in local interference. The hum is decreased when you plug in the satellites because the interference is spread over a longer area. You may notice that speakers tend to hum around things like cell phones and power outlets. To see if this is the case, move the speakers to another part of the room if you can, slide the desk around, plug the computer in at another room, something like this. If the hum gets louder or quieter, it is interference at your new place. This can be solved by finding a new area to set up your computer stuff at. Since it's mostly the subwoofer, try elevating it off the ground, there may be a power main running under the floor.
SOURCE: subwoofer problem
Sound like a component inside the sub is overheating. Most likely will need to be replaced.
Thanks,
Lee
SOURCE: Makes a loud humming sound and blows fuse behind controll panel
Most likely a shorted capacitor is causing the fuse to blow. Easy and cheap to fix.
Check with www.martinmicrowave.com or call toll free 1-877-894-0035 for parts info
SOURCE: Sunfire Mk II hum (different from greekboy post)
A reply to Soothsayer's request for clarification: My hum starts as a result of a loud, low-frequency "use" of the sub....but the hum does not seem to go away by itself, even hours later. I have not yet had the chance to access the sub's innards and try Dylan's suggested fix, but it gives me hope. I agree that Sunfire's repair fee seems excessive. Best of luck, let me know what you find?
SOURCE: loud humming buzzing sound coming from subwoofer
make sure you have the speaker connection right if you do then it is a ground problem try plugging it in a different outlet
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