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What's the physics behind this phenomena (sound / electromagnetics)

  1. Sep 18, 2009 #1
    I have a stereo set-up with a sub-woofer. Sometimes, if my laptop is plugged in close by or in the same outlet, the sub-woofer "hums". It's not like a rumble, it's like a long, low, note.

    An engineering major told me that it had something to do with magnetic fields being generated or something, but I wasn't entirely sober when he was explaining it to me. What could be causing it?
  2. jcsd
  3. Sep 18, 2009 #2


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    Staff: Mentor

    Electromagnetic interference, most likely. Probably conducted EMI.
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