I Installed the 1.3 patch and turned On the Surround Sound and the EAX4.0 HD, After that every level,EVERY sound (like characters talking) had an echo!! it's pretty annoying. Not only that, but sometimes the game would freeze fatally and I would have to reset my PC. I have a CREATIVE SOUND BLASTER AUDIGY2 ZS with the Mediasource Software (With latest drivers) And I have a CREATIVE INSPIRE 7.1 Surround Sound System hooked up to that. Can Someone PLEASE help, I wanna play Doom 3 with my Sound System!
Turn off the EAX 4.0 HD support and see if that helps. That's all I can think of.
Okay, I just downloaded the 1.3 patch. I have the exact same sound card as you, with surround and EAX 4.0 HD enabled. I'm hearing the echo, too. The one thing I didn't do was download the latest driver for the sound card, since it's only a beta. That might be the problem. Try downgrading your sound driver to the one you had before this latest driver and see if that does the trick.