Posted June 21, 200916 yr I now have a re se 12" running off of a hifonics amp that is putting 900rms at 2 ohms to the sub, in a 2 cubic foot enclosure ported at 32hz. would it be a sufficient upgrade to get a Fi Q 12", and put it in the same box with the same amp? i would run the amp at 1 ohm. it's 1 ohm stable at 1200rms. and both subs are within the specifications of the box. ups and downs of this upgrade? very noticable difference because of xmax? (RE=18mm, Q=27mm)