Question about Bose Companion 3 Series II Multimedia Speaker System (3-Piece) - Graphite/Silver

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Loud hum when Bose Companion 3 Series II speakers are turned on.

When I turn on my Bose Companion 3 Series II speakers I get a loud hum. I think it could be a wiring issue but someone else told me it could be the motherboard. I have all of the outside connections plugged in the right way and it doesn't look like any of the inside wires are frayed or cut so I can't figure out what it could be. Any help would be most appreciated!

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I had the same problem for many months. I asked a sound & video professional and he suggested I move the subwoofer away from any power source. I had the subwoofer next to my UPS. Once separated and moved all wiring away from the power supply (about 12") the low bass hum was practically gone.

Posted on Nov 14, 2009

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