Similive,

The speaker sitting atop the sub is the center speaker. As for stacking V/S putting all the speakers on a single platform at the same level, I don't know if there would be an advantage or not. This is something you'll just have experiment with.

And, as you can see, both the 2200 and 5500 can be used at the same time. That's one hell of a lot of speakers puttin out lots of sound.

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)