Some soundbars with Dolby Atmos technology use upward-firing speakers. This means that sound is projected to the ceiling, then reflects back down on you to provide a full experience of lifelike sound overhead and around you.
Soundbars with upward-firing speakers will deliver the most natural, true-to-life sounds emanating from above and all around when a room has a flat, non-vaulted ceiling as high as 14 feet (4.3 meters), and with a clear audio path from the top of the soundbar to the ceiling.
The second type of soundbar enabled with Dolby Atmos is one that does not have upward-firing drivers, but instead uses height virtualization to reproduce the effect of Dolby Atmos sound placement and movement above and around you for sound that is more expansive, even in smaller rooms.
Based on extensive Dolby research into how we perceive sound, Dolby Atmos height virtualization applies carefully designed filters to individual sounds that come from overhead. These filters simulate sounds arriving from overhead, to give you a more immersive and expansive experience.
Dolby Atmos soundbars which utilize height virtualization allow for more flexibility in room environment since it doesn’t rely on ceiling reflections to deliver the Dolby Atmos experience.