2 Subs 1 chamber or 2?

same port is better and easier

from what i've read, it's better to put them in separate chambers. that way, they won't cancel each other out. also, i don't think an amp can put out the same exact power to both subs so being in different chambers should work better. another reason is that if one sub blows, i think that the other would have a better chance of blowing if they're in one chamber. idk, i'd wait for others to chime in but that's my .02

It kind of depends if you are supplying a mono signal to the sub amplifier. If you are supplying a summed signal, than it would be ok to have them in one compartment. If supplying them a left/right signal, where each sub would be running off a separate signal then you will want to have separate enclosures.

single chamber.