Your setup equates to what is referred to as 7.1 (more technically speaking 6.1 if you've only a solitary back surround). The minimum requirement for Atmos would be a 5.1.2 setup if using your receiver. This would be a setup consisting of a left and a right speaker, a centre speaker, 2 surround speakers and 2 Atmos effect speakers. The Atmos speakers can be height speakers located on your front wall, ceiling speakers located on the ceiling above you or upward firing speakers placed at the front of the room that attemprt to emulate ceiling speakers by bouncing their output off your ceiling.
A basic 7.1 setup such as the one you have cannot ordinarilly portrat Atmos and your receiver will not even acknowledge the presence of Atmos metadata without you doing away with the solitary back surround speakers and adding 2 Atmos speakers.
DTS:X can be portrayed irrespective of the speakers present, but will not be exploited to its full 3D immersive potential without using additional height, ceiling or upward firing speakers.
There isthe option to use Height Virtualisation to create the effect of there being physical Atmos speakers present. THere's a SPEAKER VIRTUALIZER mode within the mode options.
You can use this when the sound mode is “Dolby Atmos”, “Dolby Surround” or sound mode that has “+Dolby Surround” in the sound mode name, but this mode is as yet not operational and is planned as a future update. You'd still be better off using actual physical Atmos speakers though.
Similary, the receiver also has a DTS Virtual:X mode. This is DTS’s proprietary virtual height and
virtual surround processing. It too will create virtual height speakers for setups devoid of physical height, ceiling or upward firing speakers. Again, you get better performance from actual physical speakers though.
All in all, you need at least a 5.1.2 speaker layout if you want access to and the ability to portray Atmos audio.
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