Chad from AA told me 400W ported to a 12" would be fine. If you're going sealed you could probably even do more. He stated that the thermal power handling is way over 350W but they'll run into overexcursion if you push them too hard.
that isnt near large enough for a ported box.. about perfect for a sealed one though.. if you want to run it higher then 350 i would build a larger box.. it needs to be AT LEAST 1.2 cuft for a ported box. then 400+ no problem.
Sealed it can do 450-500 just be careful with it....
I had two of them in a "doubleshot" type enclosure and was feeding 500 to each of my 8s at one point....