I have noticed that on the case, the 4 DVD pack of the recently available Star Wars collection DVD, says that it supports Dolby Digital EX. Last time my home theater system tried to play a Dolby Digital EX DVD no sound was available and then I chose the Dolby Digital ES option and it work. It seems my system does not support the DD EX configuration. My system also supports DTS. I have ordered online the DVD collection and now I am afraid it won´t work!! I saw no DTS signs nor Dolby Digital or Dolby Digital ES!!!! Do I have to buy a new home theater system????!!!