Originally Posted by AustinJerry
Seldon, TBH, I have never even noticed the "Auto" setting under the Direct menu. I read the user manual section that describes the Auto setting, and it says it selects the appropriate mode based on the content the pre-pro is receiving. I am not sure what this means. So, for example, I am receiving two-channel stereo from my Sonos system, which I usually play in PLII Music mode. When I switch to Auto, it sounds like Stereo mode, and the subwoofers are being used. So what would the advantage be of using Auto?
The advantage of Auto is that it automatically selects the correct decoder but without Direct or Pure Direct enabled. D+M is using their traditional cryptic version of English to describe the feature.
As I was trying to say, and as you discovered, that's exactly and all that it does. When the Direct options are deselected by you selecting Auto, it re-enables Audyssey MultEQ and bass management but it does not enable any of the remixing options. Specifically, Stereo and Virtual downmixing as well as PLII, Neo:X, DSU and DSX upmixing are all off until you subsequently select one of them again manually. (e.g. by making a different selection using the Music button or any of a number of other ways.)
In other words, when you select the Auto option on the Direct button, a 2.0 channel soundtrack will use only your front main L&R speakers, plus the subwoofer if you've set those channels to be "Small".
The equivalent of the Auto option is included in the Music, Movie and Game menus. When you're playing a specific type of soundtrack (e.g. TrueHD), you'll see its appropriate decoder as one of the options. (it's usually the second one, right under Stereo.) Just as when you select Auto, when you select that decoder entry, none of the remixers are applied.