60Hz Hum coming from speakers when power adapter is plugged in?

Discussion in 'MacBook Pro' started by RaptorJesus, Jul 28, 2008.

  1. RaptorJesus macrumors newbie


    Jul 14, 2008
    I bought a set of speakers for my MBP today (Logitech X 240 3.1)

    And Ive noticed that when the power adapter is plugged into the computer, a 60Hz hum comes from the speakers. Playing music covers this hum up pretty well though. The second I unplug the power cord the hum goes away. I have tried different combinations of hooking one up a power strip and the other directly to a wall outlet thinking that might help.

    Its nothing catastrophic, but has anyone else had a similar problem? If so what have you done to remedy the situation?
  2. alphaod macrumors Core


    Feb 9, 2008
    You need to use the optical out and an external soundcard with a filter to clean the sound up.
  3. Sun Baked macrumors G5

    Sun Baked

    May 19, 2002
  4. nephilim7 macrumors regular

    Jun 13, 2008
    it's not an apple problem, it's a ground loop problem. Try the 3 prong plug in, if that doesn't fix it make sure everything that connects to the computer goes through one circuit.

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