Well i kinda know it matters, but i use to have an Alpine IDA-x200 until it started going ApeS*** on me and kept malfunctioning. Because i need music, i just went to BestBuy to get a HU, and i looked at the Alpine models and they all only had One set of Preouts, I need at least two. The only one i found that had more than one preout was a newer Sony Model , and it doesnt seem to be doing as good of a job as my alpine did. Is there really much of a difference when it comes to HU?