Verify that "Bitstream" or "Passthrough" is explicitly enabled in your media software (Plex, Kodi, VLC).
The for your specific AVR (Denon, Onkyo, Marantz, etc.) download dolby atmos demo disc
You cannot download lossless TrueHD Atmos from YouTube. YouTube uses Dolby Digital Plus (lossy E-AC-3). It’s fine for a quick check, but not for calibration. download dolby atmos demo disc
A true Demo Disc (or the rips found online) typically utilizes with Atmos metadata. This is a lossless codec. It is the digital equivalent of hearing the air move in the recording studio. download dolby atmos demo disc
Good for testing sound immersion and envelopment.