I'm new here and don't know much about the electronics. I would like to connect my mp3 portable player (like a creative nomad etc.) with my car speakers. I got 4 speaker in the car, and I used to have a car stereo with 4x45 output. What kind of amp do I need for this and is there something else I need for this? Is there a guide somewhere about what do I have to do? Thanx to everyone.