I can't decide..I have about 2.5 cubes to work with. I will be getting a new amp, most likely something around 1500-2000 watts at 1 ohm (was looking at the massive audio nano line..any other recommendations?). It's going to be in a trunk car. I figure 2 flatlynes would be louder, but the xcon reviews sound so convincing. So what would you pick?