My AVIA disk arrived today so I went home for lunch and ran through a few chapters. When going through the test sounds for the surround system, the LS & RS sounds came out of both surrounds at the same time instead of one at a time. When doing the 'in-phase/out-of-phase' test, the sound was on/off instead of alternating. The test sounds are right when using the reciever's setup signals and the DVD to reciever cables are hooked up right. The speakers are wired correctly. Any ideas as to why this would happen?