Originally Posted by Farayar
Hello everyone, I recently became the owner of a D2v. I am a newbie in all this, thus please excuse me if my question is absurd. I am currently using PLIIx Movie mode to hear 5.1 sound tracks. Last night I gave a try to “None (5.1)” without any THX processing and I think I hear an improvement about general sound quality. Is it right to use “None” as my preset mode in all the sources playing 5.1 material or is it something that should not be done at all?
This is all a matter of personal taste. There's no "right" answer. If you have a 7.1 speaker system, PLIIx will generate surround sound for your rear speakers based on the content present in the side speaker channels of 5.1 content input. The result will vary with different sorts of 5.1 content so you might like this with some but not with others. Raising 5.1 content to 7.1 speakers is pretty straightforward so the odds are you'll like PLIIx in most cases. Raising 2.0 content to 7.1 speakers takes more magic, so you might find you like Stereo mode better, particularly for music.
NONE will play 5.1 input on just 5.1 speakers, with the rear speakers silent in a 7.1 speaker setup.
Personally, I have a 5.1 speaker setup so I don't even have the PLIIx option available when playing 5.1 content.
THX post processing is an additional layer of stuff. What it does for 5.1 content played into 7.1 speakers is fairly well described in the Manual. Probably the most significant change for this combo is that it attempts to "de-correlate" some of the surround sound on each side to give more of a feel that surround sound is enveloping instead of coming from specific speakers.
Personally I prefer THX post processing OFF as I think it detracts from the quality of the surround sound that ARC produces.
Keep in mind that you can specify the default audio processing in Setup > Mode Presets for each Source. Then you can alter things on the fly by using the Mode button and/or the THX button along with Up/Down arrow. The choices you'll have available when you switch things on the fly depend upon the number of speakers you have, the format of the content (e.g., 2.0 or 5.1 or 7.1), and whether or not THX post processing is on at the moment. For example the Mono Academy mode won't be available for 5.1 or 7.1 content or when THX post processing is turned ON for the Source you are listening to at the moment. And PLIIx won't be available for 5.1 content when you have 5.1 speakers because there's no work for it to do.
ETA: One confusing thing is that Setup > Mode Presets will let you set combos that aren't actually available. For example it will let you set PLIIx as the "default" audio processing for 5.1 content even though you only have 5.1 speakers present. But not to worry. The Anthem will use the correct mode in its place (NONE in this case) when you are actually listening. To see what Modes are REALLY available while listening to any given content, press Mode and cycle through the choices with Up/Down arrow -- keeping in mind that some choices will vary according to whether or not you also have THX turned on for that Source. (Press THX to see.)
One portion of the THX processing -- THX Re-equalization -- can be separately turned on/off regardless of whether or not the rest of the THX stuff is turned on for a Source. Press THX twice to see, and use up/down arrow to change. This is provided because most movie content for home theater (e.g., TV movies and commercial movie discs) have ALREADY had their treble equalization adjusted for home theater vs. commercial movie theater. So there's no need to do it again.