I bought a philips surround sound system with a built in dvd player. If i am playing a dvd on it, it works fine. When i hooked up my x-box i used the same dvd to test it. It separated the front from the back sounds, and the left from right on the front, but when it played the sounds in the back, left and right were coming from both speakers. Anybody know what i need to do to fix it?