I am relatively new to car audio and brand new to the forum but I love the quality and build of Fi subs and I need to be a part of it!. I am torn though, I've got an amp that puts out 640 watts rms and I can't decide between picking up two of the 12" black Fi day specials or one 15" SSD? The SSD is a bit more, but what do you guys think? Any help is greatly appreciated!