So for everyone who's always asking, i.e. Do I want a 12 Inch FI Q or a 15 Inch FI Q??? omgggggg
I did a winisd for both of them and on the same power. If you check the graph, not that this is all inclusive by any means, but they are pretty **** close.
Green is the 15. Red the 12.
They KEY here is that the 15 is in its correct space. Don't go getting a 15 and jamming it into a 2.5 cuft enclosure cuz its "a 15 so it has to be better".