So unfortunately I had to sell my pair of Q's recently so I figured I would post my review for them.
I had them in a sealed box and each had about 2.5 cu each. If you are looking for a great SQ sub that can also get loud don't hesitate to pick these up. I listen to trance, metal and some rap. They had no trouble keeping up with fast beats of trance and metal. I had them running on a kicker zx 2500 and they handled the power with ease. I never had them metered but my guess is that they were hitting in the low 130's to low 140's.
I know this isn't a very technical review but all I can vouch for is what my ears heard. I have never heard anyone talk badly about an FI sub and you can add me to the list of of people who have happily owned a FI q.