First thing is first... I KNOW NOTHING ABOUT ELECTRONICS! Haha.
Anyways, I was looking around and people say that you can run a sound system from your iPod or Smart phone without a head unit, but you have to have a Line Driver. Is this true? What does a line driver do? I'm asking because my truck didn't come with a Radio, and I don't want to spend the money on a Head Unit. Especially for how expensive it is for a good "Retro Style" one.
So i guess the wiring diagram would be
Smart Phone/iPod -> Line Driver -> Amp -> Speakers/Subs
(Again, I don't know anything about electronics. so please lead me in the right direction. Thanks!)