nMP: Headphone extension, can't switch Sound Output

Discussion in 'Mac Pro' started by snouter, Mar 27, 2014.

  1. snouter macrumors 6502a

    May 26, 2009
    I put a mini extension cable in the headphone out port so I can plug headphones in and out easily from behind the monitors, but I can't switch the audio out to the Cinema display if the extension is in, so I have to move the monitors and disconnect the mini extension and that defeats the purpose.

    Am I missing something?
  2. demars macrumors member

    Jul 9, 2002
    Santa Monica, CA
    I have an nMP and this works OK for me. I have a transmitter for wireless headphones permanently plugged into the headphone jack, and powered speakers plugged into the speaker jack. I can switch between them using the Sound panel of System Preferences, or more easily by option-clicking the Volume icon in the menu bar (you have to enable the volume control in the menu bar to do this).

    USB-based audio can also be handled in this way.

    If this isn't working for you, you might want to post more details about exactly what goes wrong.
  3. snouter thread starter macrumors 6502a

    May 26, 2009
    With the extension mini cable in the headphone jack, Headphones Built-in is selected in the Control Panel.

    I can't select LED Cinema DisplayPort or Display Audio USB.

    If I unplug the extension cable, I can.

    So if I want to use headphones I have to move the monitors and plug in the cable and if I want to use LED Cinema speakers, I have to move the monitors monitors and unplug the cable. Headphones switches to Internal Speakers and I can choose LED Cinema Display.

    Seems like I can't manually choose an output if something is plugged into the headphone jack?

    EDIT: Grr. Ok I tried the other jack, the Line Out Audio line-out port and I can manually switch things.

    tl;dr don't plug headphones into the headphones jack if you want to retain manual output selection control.

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