1) what you have is not "3d" sound, it's stereo with a crapton of reverb on top
2) bit rate and bit depth are not the sale thing
3)sennheiser uses hrtf to downmix surround soud, your solution does not.
lol 3d sound has been in fps gaming for 20 years. Refer to Colin's previous post. I use what he calls option F, for bf1 specifically. windows set stereo / game set 7.1 Which is way more surround, depending on headphones, then the game set to stereo. I think almost all soundcards nowadays support 3d audio.
ESO must be using some similar technology too cause when set to stereo/stereo it has 3d audio too. Interesting its not on that list. Curious what the audio engine is. Almost all games do. Its all 3d sound whether its hrtf technology or something else!
maybe some games that don't have good 3d virtualization like fallout 4, or if you have an ancient card that comes with ancient drivers, the gsx would help. Also we can't always blame the audio engine. sometimes its just developers poor implementation of it. But most of the games I play do natively very well, as long as I use the game zero headphones apparenlty designed to enhance those effects, I don't need the gsx for any improvement in those cases. It will only make it worse by losing clarity.
I'd say the gsx is good for crap headphones, or cups not designed for gaming, as long as only en using the surround focus (which you apparently already do) since the eq will just muddy everything and the reverb might not sound right, which you already say...... then it will help to achieve those desired positional audio effects.
But Whether something is set to stereo in windows, or in game, does not matter. Only the end resulting positional audio does. The effects designed by the game developers and your headphones to take advantage of them, are what really matters. Not a 3rd party solution.
Were you a developer of eacoreaudio? Then stop acting like you know what you are talking about. Dolby atmos uses windows stereo settings for freaks sake.
If you don't realize this you have no business acting like an authority on the subject. I told you 3d sound has been around for over 100 years. And through a pc since the 80s. troll harder.
Again, just cause they are downmixing a direct channel source, doesn't automatically make it better then any other solution using a stereo source. And definitely not automatically better then a games native 3d sound solutions. Bf1 as an example.
So with bf1, I get better positional surround without the gsx, then with it. DEPENDING ON THE HEADPHONES. Sorry to burst your bubble lol. But stop posing.