Rushy, if you're lurking, are you guys using the truaudio chip for this sound?
I too would like an answer to this question. I'm guessing so.. I believe there is a trueaudio processor in the PS4.
Now if only PC devs would support it on AMD cards... seems only logical if it's being put to use on PS4 and the bulk of the work has already been done.
DC arrived yesterday and my game is furiously updating itself. Hope to experience some 7.1 and headphone awesomeness tonight.