2 sd2.5 12 vs hd3 12

is that a 1200D or D1200? i'm assuming you have 1200 watts. i would say that the HD3 would like more power than that.

and it would be close since you're cutting the power in half when adding the other woofer.

 
I would say with that power the 2 12s are going to be better, but not tuned that low! if your going to run more power to them, then for sure watch the gains! If you plan on running anywhere in the realm of 2500 or more, then the hd3 takes the cake by far.

 
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