Not all added depth is good, especially not this. It makes good sound a must to even be decent. it also makes a gaming sound card a ridiculous advantage. It's a joke when you have people just sitting in rooms listening for when someone walks in. It just makes camping even easier.
I don't think a good soundcard gives you such a big advantage. For sure you'll hear more/further, but what's the use of it ... There's no need to hear from spawn to spawn. I guess my soundcard is normal, my headset is normal and I can still hear a lot, not miles away, but just when it's close enough to be taken into consideration. and people always ask me if I have Xfi or whatever, but like I said, I don't think a lot of players use sound as much as it could be used