Originally Posted by Sal1950
You've lost me as to your system, goals, etc???
A Auro3D enabled system would do it's own rear extraction. What does Logic 7 have to do or how does it work into this?
I think he's referring to the fact that short of the 8500 or a Trinnov level processor, the rest of the models that do Auro-3D only do up to 10.1 which does NOT include rear speaker extraction except in Auro-2D mode. It darn well should have, IMO (as an alternative to the VOG channel which often isn't needed in a room with a short ceiling as without it there are two channels being unused) and I also couldn't tell you why they didn't include CH as an option when there are enough channels to do Auro 11.1 on all the models that support Auro-3D). But in any case, with a 10.1 setup playing Auro 11.1 or greater material, you get no rear bed level speakers. You can have rear heights (which are rendered exactly the same as surround heights and so you can use an external speaker switch box like I do to choose either side heights or rear heights or even both at the same time driven in parallel with two buttons here), but there is no output from my rear speakers with Auro-3D. I can even drive rear heights and create top middles for Auro-3D here using two Dolby processors that I use to extract top middle for Atmos and DTS:X but rear bed levels are still missing. I get surround #2
side output copied back further into the room with my mixer, but no rear in that speaker and no rear speaker output period.
Thus, your options are:
1> Buy an 8500 to get rear output (which short of all of like two movies are 11.1 or less anyway and so all the rears put out are the upmixer outputs for the rest anyway)
2> Copy the side channels to the rear channels using a speaker switchbox or active mixer control (this is what actual Auro-3D 11.1 theaters do for both side and side height; they both get copied to rear bed and rear heights, respectively)
3> Extract rear channels using some form of processing (ala Pro Logic II) by using the side bed channels as inputs to extract rear channels. This would be akin to the same thing I use for my top middle side height channels (extract an in-between channel between front height and rear height). Combined, you'd effectively have Auro-3D equivalent to Atmos 7.x.6). Even without rear beds here, Auro-3D movies in even 11.1 sound MUCH more like Atmos soundtracks using rear heights with extracted top middle plus the surround #2
speakers which from the MLP effectively pull the side into the back third of the room. Certainly, the opposite is true (i.e. Atmos dropped down to 5.1.4 sounds nearly identical to the same soundtrack in Auro-3D using true Auro-3D with speakers only to the sides), especially when the mix is made from the same master (which is probably true for every Auro-3D title out there save Red Tails (which is Auro-3D only) and perhaps Johnny Mnemonic (two separate mixing teams made them from what I've read) and possibly Texas Chainsaw Massacre (not certain there; they could be both 7.1.4 equivalents as it's 13.1 in Auro-3D).
Thus, I believe he's suggesting option #3
but using a Logic7 processor instead of Pro Logic to extract rear channels from the side bed surrounds.
Personally, I believe all this bother is kind of moot since I haven't seen a single Auro-3D movie of merit released since about a year ago. I think they're "done" so-to-speak. Even their cinema offerings have dried up from a half dozen or more a year to 1-2 at most. That's a lot of Auro-3D theaters sitting there doing NOTHING but playing regular 5.1. No wonder some of them have started converting to DTS:X instead (which is pretty simple compared to going to Atmos for a theater).
It's kind of a shame. Auro had the most potential to at least sound "different" if they had their own dedicated mixes. Certainly, their music offerings are darn near holographic. Unfortunately, unless you're into chamber music, orchestral and jazz, there aren't a lot of other musical style offerings in Auro-3D whereas you can get a Roger Water The Wall (partial concert) in Atmos, although that's not really fair either as that's really just a crappy documentary and doesn't include the entire concert start to finish like it damn well should have (last one I've seen there was Live In Berlin which I still have on laserdisc).