What kind airspace are you working with? Where is your ying yang in terms of SQ vs SPL?I think at this price.. I would have no reservations when picking up two of these subwoofers.. And then you can get very good SQ and SPL when necessary.. WinISD shows two of these will take 500watts of power before reaching xmax at 20Hz in a sealed box. The only problem is that I already have a nice subwoofer (i think). 12 inch infinity kappa 120.9w. Will these be night and day improvement?