In plain language
Alongside the video flags sits a parallel set for audio. Each format gets its own control, usually with a sample rate and sometimes a channel count.
Why it matters in your setup
This is where missing Atmos is usually solved. If TrueHD or Dolby Digital Plus is not advertised, the source will not send it, whatever the receiver is capable of.
It also works in reverse, which is under-used. Removing a format the chain claims but handles badly forces the source down to something that works — better than a system that drops out every time a particular soundtrack appears.
What the DR HDMI 8K does with it
The DR HDMI 8K's audio flags cover L-PCM (mode, sample rate, bit width), TrueHD (mode and sample rate, including MAT ATMOS), DD+ (mode and sample rate, with an Atmos option), DD, DTS-HD MA (mode and sample rate, including DTS:X IMAX), DTS, and one-bit audio. Both EDID readouts show the resulting Dolby, DTS and PCM support on each side.
Need the hardware?
Open the DR HDMI 8K product page on HDfury.uk.