Quite simple really. I have a 5.1 speaker set, and that's it. How do I connect it to say.. an Ipod? I don't have an amp. I was able to get sound from the subwoofer with an RCA cable, and that's as faw as I've gotten. Do I need and amp, or can I just connect the speakers to the sub with speaker-wire? Or do I need a reciever of some sort? Thanks