Can't get surround sound

Discussion in 'Mac Accessories' started by Mac Questions, Apr 4, 2010.

  1. Mac Questions macrumors member

    Joined:
    Feb 17, 2010
    #1
    Setup: Macbook Pro with Logitech Z-5500 5.1 surround sound speakers on Leopard. Connected with a digital optical TOSLINK cable (plus mini-TOSLINK adapter.)

    What I want to do: Play games with 5.1 channel surround sound. Games in question: Unreal Tournament, Unreal Tournament 2004 (both support 5.1 surround.)

    Problem: I can't do that. Using the Logitech control unit, I can specify 4 settings:
    -Stereo (subwoofer + 2 front speakers)
    -Stereo x2 (sub + 2 fronts + same sound through 2 back speakers)
    -Dolby PL2 Music (sub + centre only)
    -Dolby PL2 Movie (sub + centre only)

    This is the problem: I cannot find a way to output proper surround sound. It's enabled in the games, I just can't find a way to get it to work with my speakers.

    Anybody got experience here?
     
  2. Guiyon macrumors 6502a

    Joined:
    Mar 19, 2008
    Location:
    North Shore, MA
    #2
    You won't be able to with most games on the Mac (not sure if most games in general support encoded output). IIRC, UT 2004 on the Mac uses OpenAL; for surround sound, OpenAL depends on having 2 or more discrete channels available (ie: for 5.1 you would need 6 channels). The optical out only supports 2 discrete PCM channels unless the app in question is capable of bitstreaming a supported multichannel format (Dolby DTS/Digital, etc) which, as far as I know, the OpenAL library that UT2004 uses is not capable of.
     
  3. Mac Questions thread starter macrumors member

    Joined:
    Feb 17, 2010
    #3
    Thanks for an informative answer. What would my options for getting surround sound be?
     

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