Had a weird thing happen to myself and several other squadmates - Falconwng and 99Mech - heard other reports of same thing, but cant remember.
Anyway, the voice and audio seems to have an "EAX" efx put on it. Like a reverb or a slight delay between the left and right Audio) And no one's changed settings in their audio setup.
The only way I could correct it was reinstalling audio drivers.
I dont have any of the Eax or crap installed on my system, just the driver for the audigy platnium ex. FalconWng has a Sblaster also, not sure what model - not sure on 99s card.