Get a Soundblaster Z -> optical out -> Schiit Modi -> Schiit Magni/Vali
This is a hefty killer setup.
Disable anything in SBX Pro Studio except the surround feature. Play with it from 67%-100% depending on your taste. 67% is more distinct, sharp in imaging, pinpointing, towards 100% it'll get more cinematic as the cues blend more in like in a home cinema. Honestly, I always play at 67% with the HD 800.