All of a sudden, I only get sound out of my center channel when I watch t.v. using prologic 2. The only change I made was upgrading my center channel (alpha center) to a bigger center channel (alpha 37c). Before I made this change, prologic 2 would play sound out of all speakers as normal. Now, it will only play out of the center channel when watching t.v. When I play dvds or music, it my receiver (onkyo tsxr501) works fine. Has anyone ever experienced this?