According to the manual of my EAD processor every detail in the center is sent to L+R speaker in phantom mode. In fact they recommend phantom mode over the center setup because most people with larger L+R speakers can't find room for the center, and that is true in my case.
As Rob says: "The center should be able to out play the L+R speakers". So what I need is probably a 4350. No room for that. The size of my setup is (from L to R) 4343, PowerAmp on table, 52 inc "TV", PowerAmp on table and 4343. Only a few cm left. And yes, the "TV" is reaching from the floor and up. Over the "TV" there are shelves with other electronics. No room under or over it for a center.