I'm using a 3.5k or aq3500.1 and have 8cubes. Trying to decide between adding two more 12" IA Lethal Inj so I would have four 12's ran at 2ohm with 2500wts .Or switch to two 15" Fi btl's at 1ohm with 3.5 to 4 k wts. Which would possibly be louder and musical? Does the cone area of the 12's have the advantage over the more powerful and design of the 15's. I know its install dependent,just want some other opinions and insight.