I apologize for what most of you will probably consider a waste of space, but I couldn't find a reasonable explanation in the primer. What exactly is pre? pro? If I never listen to radio (which I don't) do I need a reciever? Couldn't I use an amp with my CD player, DVD player, Directv reciever, and Xbox? If I have an amp, do I need (or why would I want) a pre-amp? And what does the pre-amp do? I have an older Sony ES series reciever currently (pro-logic, but before the era of dolby digital) that does basic surround. Should I just trash it when I up-grade? Or is it worth something to somebody? Again, sorry for the newbie questions, but I'm hoping to get some answers to the miriad of questions swimming around in my head. I want to make informed, intelligent decisions so that I don't have huge regrets when finished with my home theater. And to be honest, I would rather get advice here, than trusting my hard earned dollars to a saleman in a stereo shop! Thanks!