Originally Posted by AVfile
Unfortunately PLIIx cannot be applied to DTS-ES 6.1 right now for some reason.
Nicely spotted, I rarely watch DVDs and have had my OPPO set to LPCM output so I've never really encountered this. Thanks for pointing it out.
So I chucked in LOTR EE which has DTS-ES DISCRETE 6.1 and had a play. Here's what seems to happen:
1) OPPO bitstreaming - D2v uses NEO:6 I assume because it splits the single discrete rear channel to both rears for 7.1 output, or it's done by anthems own processing. Either way you end up with mono discrete rears.
2) OPPO decoding - OPPO either drops the rear channel or sums it into the sides and outputs LPCM 5.1 which allows the D2v to use PLIIx to expand to 7.1. You end up missing the discrete channel info but you gain stereo rears.
I shut down all speakers and just listened to the sides and rears. Here's what comes out while playing the same scene:
1) OPPO bitstreaming - with just the rears playing you hear very little in that discrete channel, almost no musical score or environmental cues, it seems to be mostly foley and some dialog. The sides handle pretty much all the enveloping musical score and environmental cues, the discrete rear is used very little compared to the sides. Playing all four surrounds and most of the environment is beside you with some few cues expanding behind you.
2) OPPO decoding - with just the rears playing you hear the foley and dialog from the discrete channel(it's either already mixed in the sides as well as the discrete rear by the studio(likely) or the OPPO is mixing it into the sides(unlikely)), but you also hear the musical score and environmental cues. Playing all four surrounds and the music score and environment expands behind you and you are enveloped more evenly increasing immersion while directional cues continue to move throughout that expanded environment.
It is strange that the Anthem doesn't decode the discrete channel then allow PLIIx to expand 6.1 to 7.1, pretty sure other processors do (inc my old Denon 3808, though I'd have to recheck to be certain).
There is a setting in the D2v's Mode preset specifically for DTS-ES which allows you to select PLIIx processing so I'm not sure why it's not applying it. Maybe it only applies to ES Matrix and not Discrete. Or maybe it is applying it and PLIIx on ES Discrete doesn't produce stereo rears, doubt it as I'm pretty sure PLIIx will always produce stereo rears(calling Rodger Dressler) .......might find some ES Matrix tracks and see what it does.
Edit: just checked an ES Matrix track and the anthem does state its decoding ES Matrix and allows PLIIx processing on it.