Hola,

En la pagina 78 del manual indica lo siguiente:

Dolby atmos are decoded as dolby TrueHD or Dolby Digital Plus in the following situations. (Dolby atmosPCM format is always decoded as dolby atmos.)
-Neither surround back nor presence speakers are used.
-Headphones are used

When the Dolby Atmos decoder is working, virtual surround processing (such as Virtual Cimena Front) does not work.