Whomever thinks you can get more than 2 channels from one port worries me.
I don't call virtual surround out of headphone ports or line outs 5.1. Thats an hrtf signal that juat happens to derived from 5.1 to create a sound field. 5.1 is only through optical or analogue. In the zxr's case, its only optical
You can blame gaming headsets and stupid marketing for interchanging terms whenever they want.