I hear a slight difference,
for example, in windows I have two 'GSX1000' options in my 'playback devices' options, I choose 'GSX1000' that has 7.1 surround sound configured/enabled. Then, if I play a game, or watch a 5.1/7.1 youtube video, I only just slightly can hear a difference between front L/R compared to rear L/R. Another example, if I watch this youtube video, I can't hear any difference between 'LEFT' compared to 'LEFT Surround' (same deal with the right side): .
This is what is confusing for me, I know its working, but just not very well, I just figured my headphones had a small sound stage...
In the settings of Battlefield 1, I choose 'surround sound' and 'hardphones' as my audio outputs, I have also chosen 'large speakers', but I did not hear much of a difference.