It has something to do with power, but that is not the primary purpose. Think of it this way. A passive crossover is someones compromise to make a set of components cheap enough for you to buy it. Nowhere near optimized for your install. Considering install is WAY, WAY, WAY more important than drivers just using the off the shelf crossover has already seriously compromised your install. That being said, most first time active installs are failures anyways. It does take time and patience and the ability to hear and want to hear the subtleties in music. I personally have Zero interest in the 360.2, they are known to be noisy and definitely limited in processing. Considering you are contemplating horns you are going to need flexibility which to me leaves you with either a couple different headunits or an Alpine H701, Pioneer P9, Audison BitOne, 12v modded Behringer 2496 or some other used units from the past.