any of you double din dvd guy's
please help me out here!
i have fitted a double din dvd today,i have a six speaker set up(fronts rears tweeters)and a sub,now i have a four channel amp running the rears and the sub

So when i turn on the radio through the dvd hu,i get output through all of the speakers sub etc
but when the dvd or cd is playing i only get output from the fronts(the speakers that run directly from the head unit

do i need some sort of decoder to convert the dvd digital output to analoge for the amp to prosess it or am i missing something here

please please help it's driving me nutt's

mark