Video: https://www.youtube.com/watch?v=VMnG9P1r1EU

Been having this problem since Skyrim came out for PC and I'm sick of it. Up until recently I assumed it was because I wasn't set up for 5.1 audio, but after tweaking my drivers and setup, I'm able to hear the entirety of the 5.1 audio clip here:

https://www2.iis.fraunhofer.de/AAC/multichannel.html

Unfortunately, this did not solve my problem, as you can hear in the video when the Jarl of Windhelm says, "Those cur- ... mages."

Any help would be appreciated.

OS: Windows 7 64-bit
Sound Card: Sound Blaster (CT4780)
Drivers: KXAudio

(Tested also with the on-board sound and the latest Realtek drivers. Same problem.)