Assuming you would like a step-by-step guide on how to activate Dolby Atmos on the Bose Soundbar 900:
1. Make sure your soundbar is connected to an HDMI connector that supports eARC or ARC. If you're not sure, check your TV's user manual.
2. On your TV remote, find the Audio Format or Audio Options button. This might be under Settings, Preferences, Options, or another menu.
3. Select the object-based audio format you want: Dolby Atmos, DTS:X, or IMAX Enhanced. If these aren't listed as options, your TV doesn't support eARC or ARC. Check your TV's user manual for more information about connecting it to a sound system that supportsobject-based audio formats.
Now that you've selected the right audio format for your system, enjoy enhanced sound from every direction — even above — with true 3D audio. *
*If using a non-compatible receiver/amplifier with virtual surround modes (like Dolby Surround and DTS Virtual:X), disable those modes before playing any content in Dolby Atmos or DTS:X . Otherwise, the receiver/amplifier will try to decode and mix the object-based audio signals into its own matrix surround processing, which can result in degraded sound quality.