Yamaha YAS-209 Quick Start Manual page 8

3D surround playback
This unit supports virtual 3D surround sound technology called "DTS
Virtual:X" . Surround sound can be heard not only from horizontal
directions, but also from varying heights when this unit's 3D surround
mode is enabled, creating a virtual acoustic environment. This
provides a greater sense of cohesion between audio and video, for a
sense of being surrounded by sounds coming from ahead, behind,
the left and right, and even above for an immersive visual and
auditory experience.
Wireless subwoofer
The supplied wireless subwoofer enables more dynamic audio
playback.
Transmission of 4K high dynamic range
(HDR) video
Enjoy 4K High Dynamic Range (HDR) content from HDR-compatible
sources such as a TV, media streaming device, gaming console, or
set-top box.
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HDMI control function
Link functions of a TV and the unit are available using the TV's
remote control. When a TV that supports Audio Return Channel
(ARC) is used, this ARC-compatible unit can be connected to the TV
via a single HDMI cable.
Bass Extension
The bass extension feature boosts bass levels for more impactful
sound.
Clear Voice
The clear voice function makes speech, such as dialog and narration,
clearer.