If you guys want to help the dev's get this solved faster all of you need to post what sound device you are using for your computers output, whether its your onboard motherboard sound jack, computer case sound jack or sound card outputs.
A poster above said he was having this problem with an ASUS P6T, I have that exact same motherboard along with a i7 920, however I'm using a Creative X-FI Xtreme Music sound card instead of the onboard sound which he may be using.
So that makes a big difference for the dev's in trying to narrow down the problems.
Post what sound jack / sound device your speakers or headphones your plugging them into, along with a detailed name and model number of it.