2 Replies Latest reply: Jan 2, 2010 2:20 AM by curt lee
Alex Johnson2 Level 1 Level 1 (115 points)
I found the advice on this site works perfectly to get 5.1 AC3 sound from Digital Out on my Mac mini:
http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quic ktime/

The trouble is, since Snow Leopard, the preference setting in Audio Midi Setup doesn't stick over a restart: it reverts to 44.1KHz 2ch-24bit after every restart. Is this a bug (I guess it is), and is there a workaround? The crackling noise is awful as a reminder...!

MacBook Air SSD, iMac Core 2 Duo and Mac mini Core 2 Duo, Mac OS X (10.6.1)
  • K T Level 7 Level 7 (23,700 points)
    Trash this plist file and see if things behave...

    com.apple.audio.AudioMIDISetup.plist


    Found in yourUserNameHome/Library/Preferences...
  • curt lee Level 1 Level 1 (5 points)
    Not to hi-jack this thread but my question is related (sort of)

    Before updating to SL my macbook's 'built-in' audio hardware could only reach resolution as high as 16bit.(44.1). (audio in and out)

    After the SL update the Audio/MIDI app says that the built-in audio hardware is now capable of 24bit (44.1) (audio in and out)

    How is this possible? How can software give hardware a resolution boost.
    Wouldn't I have to change a physical piece of gear (sound card) for that outcome?

    Or is this a possible answer?
    The hardware's ability to achieve 24 bit resolution was already there.
    But it took SL to 'unlock' it.


    Or
    Does the 24bit output refer to the digital audio outs available at the same headphone port?
    and where can I find a s/pdif cable to fit it??


    TIA


    {'-'}
    —aloha—