depends very much how the enclosure is build.and...if they where 2x12" LI vs 1x15" LI...you all would be right...BUT...in this case it's about 2x12"LI vs 1x15" DR..the LI motor is weaker than DR's...it's another kind of driver..u can't put those in the same class...the superior cone area of the LI's are anihilated by the superior strength of the DR motor...from my experience i would say that in the proper enclosure and frec. tuning 1x15" DR would give bigger output...and would sound more clear,more correct and much more low than 2x12" LI...