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PulseAudio - Debian Wiki
https://wiki.debian.org/PulseAudio#:~:text=PulseAudio%20has%20no%20default%20settings%20for%20surround%20sound,5.1%20or%208%2C%20if%20your%20system%20is%207.1.
PulseAudio/Examples - ArchWiki
https://wiki.archlinux.org/title/PulseAudio/Examples
Surround sound systems. Many people have a surround sound card, but have speakers for just two channels, so PulseAudio cannot really default to a surround sound setup. To enable all of the channels, edit /etc/pulse/daemon.conf: uncomment the default-sample-channels line (i.e. remove the semicolon from the beginning of the line) and set the value to 6
audio - How do I configure PulseAudio for 7.1 Surround ...
https://unix.stackexchange.com/questions/111428/how-do-i-configure-pulseaudio-for-7-1-surround-sound-over-hdmi
Now, to test this: Restart PulseAudio: pulseaudio -k, as your normal user, assuming you're using per-user daemons (the default). Start it... Switch to the 7.1 profile. Personally, I used pactl set-card-profile 0 "output:hdmi-surround-71"to do this, but a GUI... Run speaker-test -c 8 …
PULSE SOUNDBAR+ - Bluesound
https://www.bluesound.com/products/pulse-soundbar/
Create a wireless home theater with immersive surround sound by connecting the PULSE SUB+ and a pair of rear channel PULSE FLEXs to the PULSE SOUNDBAR+; Connect the PULSE SOUNDBAR+ with HDMI ARC/eARC for a simple one-cable connection that lets you control the sound easier than ever
PulseAudio - LinuxReviews
https://linuxreviews.org/PulseAudio
PulseAudio will up or down-mix the source audio to the set sample-rate and then up or down-mix to the sound cards highest supported sample-rate. This means that if you set default-sample-rate to 96000 and you play 44.1 kHz on a sound card with a 48 kHz limit the audio gets up-mixed to 96 kHz and then down-mixed to 48 kHz.
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