Re: using two DSP'd centers plus a LFR. I know the picture above showing the back of the unit is of the prototype, but I don't imagine it's going to be any wider, and that back panel looks pretty crowded. With a little squeezing I can see how another single input/output could be added for a center, but two might be pushing it.

But as long as the centers are matched there's no need for two separate DSP filters, the output can be split with a Y, and that run to the inputs of two individual amp channels.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris