Audio "hum" from Macbook pro only with external cable.

Discussion in 'Mac Basics and Help' started by thecunningone, Dec 11, 2009.

  1. thecunningone macrumors newbie

    Dec 11, 2009
    I have a macbook pro running Mac OS X 10.6.2

    I have tried a variety of cables (3.5mm to 2x Phono) to my mixer and each time it produces a loud hum.

    Ive tried the same cable plugged into my iphone direct and its perfectly fine so it was looking like the audio output of the mac, however, when I plug in headphones (ive tried 3 different pairs) i dont hear the humming at all!

    I've checked the audio settings and in the help it says you can change the output BUT my sound option only givens me a HEADPHONE option.

    Any help greatly appreciated!
  2. BlueRevolution macrumors 603


    Jul 26, 2004
    Montreal, QC
    "Headphone" refers to the 1/4" audio out port, whether you have headphones or speakers connected. Have you tried shielded cables?

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