So soon I'll be running 2 212 cabs, and I've thought of several ways of doing this. One is to vertically stack them. I'm 6'5" and having some of the air being pushed closer to my head will be nice for hearing myself. I've also tossed around the idea of putting one 212 under (or on top of) each of my guitarists' cabs (see how many people I can confuse by not having a cab stack behind me...). Under seems like it makes more sense, as there's contact with the ground and such, but that's just me making blind assumptions. Putting them on top might work as well, or even placing them vertical on each guitar cab. Might project the sound better? Anyways, I'd appreciate any advice on this. I have no idea if any of this would actually have any functional difference (not sure if one cab can affect another?). I'd like to know if there would be any negative outcomes from these scenarios.