Does anyone know how difficult / expensive it would be to wire a portable DVD player (Venturer 166?) sound output into the speakers of a VW Passatt. My 3 kids watch in the back of the car (making headphones a bit impractical) and the DVD speakers are (as always) a bit weedy. Being an absolute novice at ICE installation, I assume it is not merely a question of getting an extension cable and plugging jacks in, but how tricky is it to do ? Many thanks to anyone who can help / point me in the right direction.