Could the sound quality of music improve without volume control?

  • Thanks a lot to the team of Libreelec for this great tool!


    I am happy with the quality of the music from flac files playing through my avr by hdmi/optical.


    But the sound is even better when the music is playing using libreelec as upnp server. Maybe kodi needs to process pcm info before sending to hdmi/optical to allow volume control -maybe some other features- that could be degrade slightly the sound quality.


    How to volume control could be bypassed to get original pcm signal by hdmi/optical?


    (S912 - Minix U9 - Libreelec 8.2.4.1)

    Edited once, last by gercabace ().

  • Only Passthrough Audio can bypass Kodi's volume control, PCM cannot I believe.


    I would also make sure these Kodi Settings > System > Audio options are disabled first:


    Number of Channels > whatever you Sound equiptment supports. SPDIF only supports 2.0 LPCM channels.

    Output configuration > Best Match

    Maintain Original Volume on Downmix > OFF

    Boost center channel when downmixing > 0DB





    Here is a OSMC Vero 4K thread that will interest you regarding AMLogic S9xx Linux & FLAC 24bit:


    Can Vero do bit-perfect playback? - Vero 4K / Vero 4K + - OSMC Forums


    The AMLogic Linux Kernel audio mods @graham8 talks about over there are also in the AML S9xx LE 8.2.5 releases found here:


    LE Google Drive Folder


    I do not know enough minute detail about Kodi audio to be of any further help.

  • I have updated to LE 8.2.5 and change some of those settings:


    - Number of Channels > 2 (unchanged)

    - Output configuration > Best Match (unchanged)

    - Maintain Original Volume on Downmix > OFF (changed from ON)

    - Booost center channel when downmixing > 0DB (changed from 10dB)


    and ... it works!! - Now, I cannot discern between playing by upnp and hdmi/optical.


    Many thanks for your help!

  • Great news !


    Out of interest does your AVR report on the audio bit depth of LPCM when LE / Kodi decodes FLAC ?


    is it showing 16 or 24bit ?