You can turn on 7.1 if connected via USB and then turn off headtracking.
You get the 7.1 without the headtracking/fake reverb
I don't think this is 3D room emulation, basically with 3D off (head tracking and virtualization), the internal DAC would just mux everything into two channel, so no 3D room effect.
That's too bad, I'm very surprise and disappointed at Audeze for not including the option to turn off just head tracking!