My Cyberhome 402 dvd player.It is cheapy. It does not have built in decoders...Only ac3/dts output. Is ac3/dts output,meaning it can be connected to an amplifier?? How does it work?. What is the difference between a dvd player with built in decoders...and one without one?... Do you need built in decoders???.Would i be better off upgrading my dvd player?. I don't mind as long as my amplifier and speakers...work well,and deliver great sound.Thinking of the aego P5 system right now.