I hear no difference in sound output when I turn Enhanced Headphone Mode On or Off in the Call of Duty game.

If you aren't hearing the difference with Enhanced Headphone Mode On vs Off, please try the following:

1. Turn down or off the music.  For all our recommended in-game audio settings, see our audio loadout blog
2. Check that your output device is correctly set to your headphones output. 
3. Ensure in your Device's Audio Settings, that the audio output is NOT being sent to a surround sound or multichannel output. 
4. Be sure to disable any other 3rd party spatial audio or surround sound options on your gaming rig and headphones, such as Sony PS5 3D Audio, Dolby Atmos, or other in-headphone surround sound.  See our audio gear guide blog for more info

Still not hearing the spatialization?  Here are some pro listening tips!