i own a saab, which comes with a factory amp to power the back speakers. i recently replaced the factory HU, this is my question, the amp was connected to the old HU with a 6 pin din connector, which does not fit my new HU, so i get no sound from my back speakers. do i need one of these to connect this to my new HU, will this even work? its called a 6 pin din to RCA connector, made oney by some canadain company named Lorex. can someone please help.