i know this is a difference scenario...but with my PS3, i have it hooked up to my PC monitor, which has no speakers naturally. so i have my red/white RCA's converting into a 3.5mm jack, which goes into the sound card of my PC, which goes to my 5.1 speaker setup. sound is fine, and actually with the quality of the speakers is damn good. no fuzziness or humming. and i get surround sound with games/movies. so yeah it's not in a car...but i had to basically do the same thing