EXACT 3.5mm stock audio output minijack level ? Mac Pro (8core)

Discussion in 'Mac Pro' started by DULLAH, Oct 20, 2008.

  1. DULLAH macrumors newbie

    Joined:
    Oct 20, 2008
    #1
    Greetings to all.

    I have a question regarding the stock audio output on the newer 8-core Mac Pros.
    The 1/8"(3.5mm) stereo "Line Level" output minijack.

    The manual lists a max output level of +6.3dBu, or 1.6Vrms, but does not list which standard the jack conforms to.

    There are 2 common standards when "Line Level" is referred to:

    #1. -10dBV (common amongst consumer products: CD players, etc)

    #2. +4dBu (common amongst professional keyboards and MIDI modules)

    I have had no luck searching various Mac forums, nor googling...

    Does anyone know which standard the "Line Level" output jacks of the mac pro conform to ?
    Thanks for any responses.:)
     
  2. inigel macrumors regular

    inigel

    Joined:
    Mar 14, 2008
    Location:
    Australia
    #2
    I found this in the Jan 08 Mac Pro users guide:

    Analog audio out using the headphone jack (typical values)
    Based on a typical situation with playback of 1 kHz, -3dBFS 24-bit sine wave, 44.1 kHz output sample rate into 150 ohms unless otherwise specified below.
    • Output voltage: 1.4 volts (root mean square) (Vrms) (+5.1 dBu)
    • Output impedance: 24 ohms
    • Output power: 90 milliwatts (mW)
    • Signal-to-noise ratio: Greater than 90 dB
    • Total harmonic distortion + noise: Less than -75 dB (.02 percent)
    • Channel separation: Greater than 50 dB

    Can be found on page 92
    http://manuals.info.apple.com/en_US/Mac_Pro_Early_2008.pdf

    Hope this helps you out.
     
  3. DULLAH thread starter macrumors newbie

    Joined:
    Oct 20, 2008
    #3
    ^No.
    Those specs are clearly for the headphone minijack.
    But thanks anyways.:)

    I know (and listed in my 1st post) what the manual listed for the Audio "Line Level" output minijack, but would like to know which "Line Level" standard it uses...

    +4dBu

    ...or...

    -10dBV


    ??? :confused:
     
  4. fwhh macrumors regular

    Joined:
    Aug 11, 2004
    Location:
    Berlin, Germany
    #4
    The EXACT level depends on: the impedance of your mixing desk and the type of sound/wave you are playing. Rated +6.3dBu it will be able to drive both standards, as (I think so, a Mac Pro user should confirm this) you can adjust the output gain to your needs.
     
  5. inigel macrumors regular

    inigel

    Joined:
    Mar 14, 2008
    Location:
    Australia
    #5
    OH SHI-

    Sorry, disregards that. I read it wrong. :eek:
     

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