@Roy:
Nope. Didn't answer to all your statements because it a) doesn't help Ojisan_Buba b) you never tested the difference (even if you say *now* you have an X-FI) c) you just said to use cracked files, which I don't have access to (and I don't want to, honestly)
Yes, I did (slightly) pump up the bass, not even activated my bass-boost, though. Maybe I should try that - my headset surely can provide some great sound
@Ojisan_Buba:
I have no experience with the USB-Version, but there have to be some options to access surround settings either in windows or from the driver-settings (guess there are any?)
Also be sure to have Sound Extensions enabled in IL2.
Another idea would be to check whether the windows-settings are correct. I don't know if it will automatically switch from stereo to 5.1. You can also try to run il2setup.exe and set the sounddevice to SoundBlaster Live! or EAX1. I'm sorry I cannot provide further information, as I have the Medusa with amplifier here and I change settings from inside the X-FI-drivers and THX control.