I just tried LOTR extended DVD which says it is 6.1 DTS-ES. However, I selected 6.1, started playing the movie and DTS appears on the OPPO display. I pushed the audio button on the remote and on the TV screen it says it is DTS 5.1. I get sound from all speakers.

I also put this movie into my OPPO DV-983H, which is connected with a coaxial cable, selected the 6.1 track, started to play the movie and my Outlaw 950 processor display indicated it was receiving a DTS-ES 6.1 signal.

Now I'm confused.

This is with MCA 5.1 with 5.1 down-mix selected in the BDP-83 settings menu.