Background Distortion

[mrgstiffler]

I have a set of Logitech X540s with an eVGA 680i board and am using onboard sound. There's a background distortion noise in pretty much everything that's played. It's VERY noticeable at high volume. I'm not sure if this is an issue with the onboard sound or the speakers. I don't mind buying a high end soundcard if it will fix the problem but would rather not spend the money if the speakers are the issue. Any ideas?

 

[Audioguy]

Is this distortion only there at high volumes? Have you tried to get the latest driver for this mobo? I know it's rather new but they may have a newer audio driver. I would say invest in a soundcard, you will never consider onboards again.
Is there anyway you can test the speakers on another PC or Device? -Sounds like just a bad onboard, they aren't good for much really.