I tried to use a completely different power socket with the E09k, just like you told me. Sadly no difference. What I noticed, as soon as the USB plug of the mixamp even touches the frame of a PC/PS3 - USB bus, the same noise gets slightly hearable - same the other way, with the USB bus of the mixamp. And with turning the Mixamp on, it reaches his usually, uncomfortable volume level.
MLE said some posts ago, that he'd got a separate USB hub to solve that kind of problem. You folks think, this would solve my problem too? I tried a USB extention cable, without success. A USB splitter may work different...
Wait, just the outer casing of your PC and there's already static and distortion?
Perhaps you've tried this or perhaps not, but is your PC/PS3 properly grounded as well? Because it seems like anything that is electric conductive is causing the noise.