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MacBook Pro 2016 15.4". Lately my speakers go from perfectly clear to a very muffled sound almost all the time. Selecting a different frequency in the Audio/MIDI configuration or killing coreaudiod solves this issue for a second or two, after which the sound goes back to muffled. I've tried the usual reboot, resetting SMC and PRAM. As the speakers CAN sound normal (even though only for a very short time) I assume this is a software issue. Any suggestion is appreciated, thanks!

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    Having the exact same issue, MacBook Pro 2017. Found a long thread about a similar issue but it only happened when increasing the volume, where as my issue (and by the sound of it, yours too) has nothing to do with the volume.
    – Bob Lauer
    Commented Mar 9, 2021 at 16:53
  • A bit late, but I would like to add that this is the case for me as well. When I increase the volume above a certain level, say ~50%, it almost always gets muffled immediately.
    – Thijmen
    Commented Apr 8, 2021 at 7:24

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