my dvd player has a phono audio output, i used a normal phono to phono cable and connected it to the audio input on my head unit. Unfortunately the only audio input I have is for my cd changer so i used two to one phono plugs so i can have both plugged in at the same time, only problem is the head unit has to think that it's playing a cd from the changer for the audio input to be active, so i just leave my cd changer audio output disconected and connect it up when i need the changer, otherwise both would play at the same time. This is a bit of a wierd way to do it but the only way that will work for me, if you don't have an audio input on your head unit i can't think of any other way it can be done unless you use a fm modulator from your dvd player audio output, but then im not sure it would be 5.1 quality when picked up on your head unit. I hope this helps.