ok i have a problem. my reciver only has 1 sub output so i figured i would just use the LFE on my sub. My problem is in order to use LFE in need to be in Dolby digital or DTS on my reciver, but i dont know how to get my reciver into Dolby Digital or DTS. has led idicators on my reciver that tell when its in Dolby Digital or DTS mode but i have never got these lights to come on. How do i get my reciver in DTS or Dolby Digital. Thanks.