Tal vez porque ya es algo de cajón, por eso no lo anuncia.

Además el manual sí lo aclara.

En dts tienes el: DTS Neo:6
This mode expands any 2 ch source for 5.1 ch multichannel
surround playback. It offers full-bandwidth on all channels,
with great independence between the channels. There
are two variants for this mode: one ideal for movies and
another ideal for music.
– Neo:6 Cinema: Use this mode with any 2 ch movie.
– Neo:6 Music: Use this mode with any 2 ch music
source.


En Dolby: Dolby Surround
Dolby surround is a next generation surround technology
that intelligently up mixes stereo; 5.1 and 7.1 content for
playback through your surround speaker system. Dolby
surround is compatible with traditional speaker layouts,
as well as Dolby Atmos enabled playback systems that
employ inceiling speakers or products with Dolby speaker
technology.




Lo saqué del manual, búscalo en Advanced manual, a partir de la página 16.