Scratchy noise at mid to upper volumes

I have a ASUS P6T motherboard with built in 5.1 surround sound and recently when I turn the volume up to a normal level I get this scratching sound. The speaker system is a THX Megaworks 550, Model: MMS4650. I've been out of electronics for quite a few years so I don't have an O'scope anymore so I'm having a hard time trying to figure out where my problem is originating from. I've plugged in a headset and with it the sound was absolutely fine. This leads me to believe the amp on the THX has a bad cap somewhere. They all look good which is totally inconclusive, but I was hoping something might be obvious..not! Anyway without a scope I can't be sure if the problem is originating in the final outputs on the MOBO or in the finals in the THX amp. Also BTW it is not burnt speaker coils, I checked that right away.
If anybody has some suggestions on narrowing down where the probem might be I'ld really appreciate any tips.
Other than that I'ld like to try to just buy the amp board that goes in the sub-woofer or the sub-woofer itself. I've written creative a couple of times on this but I'm not getting any help whatsoever! A schematic would be a big help too if anybody knows where to get one for this.
Any help, any tips would be greatly appreciated! I just can't see having to buy a whole set of speakers because of a 5 dollar part!!!
TIA,
John W.

This is a problem I started experiencing with my MacBook after about 1 year. The problem is most likely to occur when the machine is warm or hot (SMC fan control reports 60+ degrees celsius). The problem is related to the sound "card"/speakers, and it definitely is related to video playback. The interesting thing is that the noise does not occur with headphones plugged in and resumes when unplugged. I finally got fed up and took a screwdriver to my machine. The noise you describe is being emitted from the left speaker. I get the impression that the video codec must change the state of a sound "card" / chipset that causes the audio to misbehave. SMC fan control can be used to increase the fan speed on your machine as that does alleviate the problem, it also increases fan noise. :-/
I am disappointed to hear you are experiencing the same problem on a new machine. I was hoping to eliminate this nuisance with my next upgrade.

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Chillarescue wrote:
Just got the air on Friday at 8am. Watched three episodes of TV on it, ready to return it! ..
Then do so.
Chillarescue wrote:
... I'm really dismayed. ...
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tbirdparis wrote:
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Scratchy noise at mid to upper volumes

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