Optical Audio Out and Volume

Discussion in 'MacBook Pro' started by kolax, Jun 30, 2007.

  1. kolax macrumors G3

    kolax

    Joined:
    Mar 20, 2007
    #1
    Not really a problem, more of a wonder. Optical audio uses light - therefore doesn't carry an output affected by volume, does it?

    Why is it I can adjust the volume using VLC Player's volume control when connected to my amplifier using optical?

    I'm baffled.
     
  2. flopticalcube macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #2
    Optical carries a digital signal. The volume information is encoded in the digital signal.
     
  3. kolax thread starter macrumors G3

    kolax

    Joined:
    Mar 20, 2007
    #3
    Why is it Apple decided to disable the volume controls on the MBP when connected by optical?

    Do I benefit from sound quality when watching a movie by turning the volume low on VLC Player and turning my amp up so the amp is dealing with the amplification not the laptop? Although the laptop isn't amplifying anything though - I'm really confused. What is it that amplifies the signal in relation to the digital signal volume?
     
  4. flopticalcube macrumors G4

    flopticalcube

    Joined:
    Sep 7, 2006
    Location:
    In the velcro closure of America's Hat
    #4
    Optical out is like line out in the analog world and is usually not volume controlled. It comes out at a consistent volume level so that volume can be adjusted at the final destination (the amp).
     
  5. mach macrumors member

    Joined:
    Jun 5, 2007
    #5
    Speaking of optical out, do you (or does anyone) know if when using the optical out the MBP still has the pops and hums that have been reported as happening when headphones or stereo speakers are connected?
     
  6. kolax thread starter macrumors G3

    kolax

    Joined:
    Mar 20, 2007
    #6
    Never experienced that.

    My optical is crystal clear - great sound and bass is very responsive (I have 4x4" speakers and a 12" subwoofer) compared to analogue output which isn't very good considering the MBP is handling a certain amount of amplification which is nowhere as good as my dedicated amplifier.
     
  7. sotl macrumors member

    Joined:
    Feb 14, 2007
    #7
    A question for you all. I have a MBP non SR (has ATIX1600) and prior to installing the audio driver in windows a red light was coming out of the headphone jack. After I installed the Sigmatel drivers it shows a digital input/output below the analog i/o and I always wondered why this was. Does this mean I have an optical out?
     
  8. kolax thread starter macrumors G3

    kolax

    Joined:
    Mar 20, 2007
    #8
    All MBP's have optical out. Red light is optical yes - it is actually flashing really fast carrying a digital signal.
     

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