Is it Atmos for headphones? Because Atmos is ATMOSphere, ie, a surround speaker that doubles the FL-C-FR if not all speakers that are set higher, that way when some sounds are meant to come from above - like the Quinn Jet and Iron Man take on Loki in Germany, or when a Blackhawk hovering overhead gets shot and comes down - you'd hear more of some SFX (and dialogue, as when Black Widow threatens Loki with an autocannon) coming from above.I have been searching around and have yet to find any definitive answer.
Can you use dolby atmos for headphones with an external dac? I have an old Fiio Alpen and it doesn't really seem to work. I can turn atmos on, but attempting to hear sample content through the atmos app nothing comes out and it tells me to check my set up. I am using the SPIDF input.