I added a center channel to my system. I first installed the Mid alone, then I added a tweeter. After a few days of tweaking and running acoustic calibrations, I removed the tweeter because it was just "too much" and I got a better center image without it. Also, it got pretty hot since it was on top of a vent and it is pretty cold where I am right now.
Center made L7 more convincing but I have to admit that I prefer when music comes from all around instead of in front of me, and bass comes from behind. Of course thatreally depends on the kind of music being played but that would be a general rule.
Any idea how to make the center speaker play when not in L7 mode? The MS8 shuts it off. Would rears help? I recall reading a post on dyima that said that rears helped center a lot?