SPDIF output level

Discussion in 'Digital Audio' started by davidoloan, Apr 19, 2017.

  1. davidoloan, Apr 19, 2017
    Last edited: Apr 19, 2017

    davidoloan Suspended

    Apr 28, 2009
    My Panasonic plasma, which I use with my Apple TV4 is used to output through SPDIF to an Arcam DAC which I have connected to an Arcam stereo amplifier.

    The TV setting is "SPDIF selection : PCM" which I have selected, and the "PCM Optical Level" is -10DB by default.

    If I increase the PCM optical level (on the TV's control) to -8DB, -6DB,-4DB,-2DB or zero DB the sound level at the speakers increases.

    Is there any reason why the default PCM optical level on the TV is so quiet, and any reason not to turn it up to zero DB?
  2. cbautis2 macrumors 6502a

    Aug 17, 2013
    Maybe the SPDIF is digital and a setting of 0 DB should be the reference since it's preferable to adjust the volume in the analog stage.
  3. BrianBaughn macrumors 603


    Feb 13, 2011
    Baltimore, Maryland
    The -10dB default could be to protect whatever is receiving the signal.

    You will have to check with the Arcam device manufacturer to see if 0dB input is safe or acceptable.

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