Satellite A500D-10E - USB sound is cracking/jittery during playback

Hi!
I'm having some problems with my USB Audio on my Toshiba A500D-10E.
The sound is cracking/jittery during all sound playback. Even system sounds when the computer is otherwise idle.
I have tried two different USB sound devices (Creative Arena USB Headset and Sandberg USB Sound Box 7.1), both with the same crackling sound, both working just fine on two other laptops.
It's not feedback noise, It is only when sound is playing I get the crackling sound.
When no sound is playing, the speakers are quiet.
The Conclusion is that there is some fault with running audio trough my USB ports.
Mouse, harddrive etc works just fine over the USB ports.
Running sound trough my onboard soundcard works just fine, except it does not have analog 5.1 output available, thus I need an external sound device to get analog 5.1 sound output. I am now using the Sandberg USB Soundbox 7.1 to achieve this.
I have tried the following:
Installing the newest drivers for the USB box
Tried using the windows-provided generic drivers.
Reinstalled Windows (twice)
Tried all the different usb ports
Tried without any other usb devices plugged in
Adjusted the output bitrate
Disabling the onboard soundcard
Disabled all other sound devices, including recording devices
I have the newest BIOS update (1.20)
I have a Toshiba A500D-10E laptop
2.3GHz Dual core prossessor
4GB ram
Radeon HD 4600 series VGA card
Windows 7 Home Premium 32bit
All USB ports are USB 2.0 compatible.
Could you please help me solve this problem? I've done some research and think there might have
something to do with IRQ sharing, allthough I can not find any good explainations as to how I would go about to fix it.

>Like I said, I have tried two different USB sound devices (Creative Arena USB headset and Sandberg Soundbox), both work just fine on other laptops I've tested them on, neither works on mine. So I don't think it's the external sound devices.
Did you test this with different installed Windows systems?
How about power saving for USB ports?
Try to disable this.
Try to connect also the external USB sound card to an external USB hub with an own power supply
Would be interesting if the same happens too.

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Before you even suggest it, I have a rather high end PC, phenom II 4 cored PC with 4GBs of RAM and a Caviar Black Hard dri've, so it's NOT that the PC can't handle the load. Its jsut browsing with music in the background... with half decent drivers, a 5 year old Celeron PC should be able to handle that...
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Satellite A500D-10E - USB sound is cracking/jittery during playback

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