Sennheiser AMBEO Max Instruction Manual page 22

Connecting devices to the Soundbar
22 | AMBEO Soundbar | Max
Preparation
Adjust the sound settings on the TV and on the audio/video device.
▷
On your devices, adjust the sound settings for the HDMI and opti-
cal output from "Downmix/Stereo" to "Auto/Bypass/Pass-
Through". (The menu of the devices may use different names
depending on the manufacturer).
This ensures that the audio signals for 3D spatial sound from the
source (e.g. TV) are passed on to the AMBEO Soundbar | Max.
Downmix/Stereo
Auto/Bypass/Pass-Through
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On your TV, set the Soundbar as the audio output.