Monsters Inc. Blu Ray DTS-HD - 5.1/6.1?

[mattjax05]

When I played this disc through my AV the no. of channels inputted were 6.1 despite the advertised 5.1. Is this a misprint on the case?

 

[Tom Moreno]

No misprint. The Disney/Pixar films often come with a DTS-ES matrix flag on the DTS-HD MA track. They are meant to be played with matrix decoding of a surround back channel despite only being encoded with 5.1 discrete channels as this is how the mixes were engineered for THX-EX. Most of the cases claim the audio is 5.1 but, if memory serves me right, a few of the later releases call it a 5.1ES track. Guess it's better to put the number of discrete channels on the packaging to avoid getting flamed for advertising more channels than are discretely available. The Platinum animation disks and Toy Story 3 have fully discrete 7.1 tracks.