Changing from 7.1 Surrond to Stereo

So I have a wired Man O War headset and I lost the aux to usb adapter that gives me surround sound. Now I just plug it into the aux cord but it plays in stereo (the main noises of thing such as the singing in music sounds faint and the background is extremely loud. I'm guessing that means it wants to play in surround. I don't know how to change it to stereo. There is no enhancements tab and it doesn't show up as the headset but instead it shows Realtek high definition audio. It still plays in my headset though. So if anyone knows what I'm missing or if I'm just dumb, that would be very helpful. :)