@Litlgi74
This p. 57 of the document
https://www.dolby.com/siteassets/te...atmos-installation-guidelines-121318_r3.1.pdf that you're referring to specifically describes placing of
Height Speakers for Dolby Atmos.
Normally and in the beginning Atmos only worked with
top speakers. Dolby refers to them as overhead speakers. The Realiser names them top speakers.
For many Atmos setups there ar two different layouts, one with top (overhead) speakers, in the Realiser just called 7.1.4 for example, and one with height speakers, Smyth adds an "h" to the layout, so 7.1.4h.
top (overhead) speakers should have a greater elevation (ca. 45 deg) and usually mounted on the ceiling. heights should have around 30deg elevation and usually mounted on the front and back walls.
Auro 3D works with height speakers at about 30 deg (plus one optional speaker directly above the listener, called voice of god...)
So a "normal" Atmos installation with top speakers is not really compatible to an Auro 3D installation.
Dolby later introduced height speakers (to be more compatible with Auro maybe...?)
There is a home cinema enthusiast from Germany who I know, he wrote a "one for all guide" for a combination of Atmos and Auro.
Normally discussed and available in a closed facebook group (I do not use facebook) but the german dealer "grobi.tv" linked it (english version) in his blog:
https://www.grobi.tv/media/pdf/54/3...-Guide_V5-0_englisch_publishigPUdX9hPlgSJ.pdf
But be "warned": Holger who wrote the guide and "grobi.tv" are strong proponents of Auro 3D, they are in contact with Wilfried van Baelen, the inventor of Auro, and also visited the Galaxy Studios recently, there are videos on the grobi.tv YT channels.
grobi is known for criticising Dolby Atmos all the time, making videos where they switch off the listener level channels to show that the top (or height) speakers don't do much over the whole lengths of many movies, whereas with the Auro upmixer (because there are nearly no movies in native Auro) there is always sound on the height channels...
So they
may be a bit biassed towards Auro...