Rear seat entertainment system Audio

[Magicnumber45]

I just bought a 2008 cayenne turbo that had the dvd system in the headrest. Does anyone know if there is a way to make the audio for the system play through the car stereo. It's too hard for my little one to use the headphones. If there isn't a factory way to do it is there anyone who has modified something to make it work. Thanks for the help