If I can ask a slightly off-topic question...
Anyone with any of these Pioneers (or Lena with your Panny) know if they will downmix a 'phantom center' while playing DVD-A or SACD??
I've asked this EVERYWHERE and no owners seems to ever know.
I had an idea, although it's not exactly what you asked about. If you really want to downmix the center into the L&R to get a phantom center maybe you could use a small studio mixer to mix the 3 into 2? 'SoundHound' would be the guy to ask on this one I suppose, but it seems like it might work and might let you avoid getting a center speaker and still enjoy DVD-A.
Have a good one.