Even though I'm OK with my 5.1 DVD sound, I'm still a little confused if your center speaker is suppose to be different from your 2 front & 2 rear speakers, assuming they're the same speakers? I have the Orb Mod 1 set up. Some people who have the Orb Mod 1 have a Mod 2 center (which is simply 2 Mod 1 speakers combined). Other people with different speaker systems, have a center speaker specifically sold as that, that is different from there front & rear speakers. If I don't have or notice a problem with my DVD sound, is a different Center speaker necessary to get optimal DVD 5.1 sound?