Hi I got the U7 Echelon Yesterday. even though it has a different basic user interface, not the XEAR stuff, but the Sonic Studio Pro, you cannot select more than 2 channels when selecting headphones. But the surround channels are very much there either with Sonic Studio or with Dolby activated. And the funny thing is that the sonic radar activated in game shows you exactly from where the sonic clues of your enemies or the environment come from just check the video below for further clarification.
https://www.youtube.com/watch?v=KTn3c40ocnM&feature=youtu.be