I picked up a cheap Odroid C4 to test.
24bits is fine . But the bad news is 8channels does not work out of the box for the Odroid - only stereo,
8ch audio does work for the RPi4 out of the box but limited to 16bits.
Here are some screenshots below.
Any tips what this means?
See 8 channel speaker test below, It runs but AVR only shows stereo and sound is only from ch1 and ch2 speakers. Nothing out of the other 6 speakers