Is it ok to stack the 2200. Currently I have 3 monos spread out to fit inside my entertainment center. I was thinking if I could stack 2 of them I can tidy up the cords a bit.

The Outlaws told me it was OK to go 3 high. I have them stacked 4 high. Just be alert to the weight capacity of your shelf, since these amps are 20# each.

Yes, you can stack these. If the top of the top unit is hot to the touch, I'd recommend a temperature controlled fan be placed on top.