Not sure on exact power, i set them w/a dmm to ~ 1200 watts each using the AB500.1 in my sig (running it @ .5ohm). After imp rise and voltage drop i'm not sure, but voltage doesn't drop lower than 12.9 playing full tilt @ idle. I also tried setting the gain by ear, but they didn't seem to like taking any more power than that.
They take the power i'm giving them well for daily (what i set w/the dmm), but i wouldn't try running any more power than i'm running now.
All the info from my setup + a link to my build log is in my sig if you want to check it out.
edit:
i just noticed you have a FI Q. I had a 15" in the same box you had (except slot port instead of aero). I actually enjoy the sound of the AQs compared to the Q. What kind of music do you listen to? I found the AQs sound similiar on rap (only louder) but imo sound better on rock than my FI.