Hello, 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. I finally have a desktop set up and was planning on getting a Schiit stack, but as I enjoy atmos for overwatch and I really don't want to have to switch back and forth.