MacOS Monterey sound problem

FesneuAV

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I have a Denon AVRX3500H AV receiver. When I connect a macBook pro 2015, with macOS BigSur, everything works just fine.

When I connect a macBook pro 2020 M1 with macOSMonterey, it works fine if the sound comes out of the mac, but it does not work when I select to output the sound to the AV receiver (in that case, it starts buffering like crazy).

Anyone know how I could try and solve that issue?
 
How are you connecting the machines to the Denon.
Presumably the 2015 MBP has a built in HDMI socket

It's not 100% clear which M1 Pro you have but if it's the 13" version that has USB-C only so must be using an adapter of some sorts.
 
It's the 16 inches model, with an HDMI port.
So I do not need to use an adapter.

Any sound that goes to the AV receiver via HDMI (even playing a simple MP3) is breaking extremely badly.
 

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