Hey guys! I've bought my GMX A2.1 system quite some time ago and this is the first time I'm complaining about this problem even though it has existed ever since I purchased those speakers. I've read about this problem in the manual that if you accidentally exchange the wires of the satellites connecting to the back of the subwoofer you will hear this hissing noise. I tried every possible configuration of the wires, and the noise is still there. Is there any way to get rid of this annoying hissing sound? Thank you. EDIT: Never mind, I've found the other threads dealing with this issue.