OK, I know there has to be a good reason but, How does it get out of phase? How do you know when it's in/out of Phase? I can see how it would affect the other speakers if you mix up the connections ( + - ) etc. The powered SUB just has one cable and it can only be connected one way. So, if it's out of phase it would seem the Receiver is sending a signal out of Phase. How would THAT happen?