The Aq will sound just as good as the Fi if not better. The Design and build of your enclosure will be the biggest detrmining factor of how it sounds. The Aq requires a break in period before slamming on the low stuff, to avoid any potential motor noise.If you plan on using an 18 and 2200 watt amp I doubt your main concern is SQ:laugh: I bet your looking to get loud and maintain some listenable amount of clarity

Aq will fit what your looking for, I have a pair of the AQ HD 12's and they play amazingly well in the 30-35 hz range. Very full clear bass and not a hint of any motor noise. I am running the pair on Mmats 2200.1 and they seem to want more power. Aq has a awesome product and some of the best service i have ever see.