Sony NPA-MQZ1K Multi Battery Adapter Kit - Manual (Page 124)

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You are concerned about a delay between the
picture and sound.
If a Bluetooth audio device is connected
The picture and sound do not match because the sound is delayed due to the properties
of Bluetooth. You can adjust the output timing of the picture and sound with the A/V sync
setting.
Set [A/V sync] to [Auto] or [On]. Press the (Quick Settings) button on the
remote control, then select [Settings] — [Display & Sound] — [Audio output]
— [Bluetooth device settings] — [A/V sync].
If a specific audio system is connected with an HDMI cable
If the audio device is connected with an HDMI cable, the sound may be delayed due to the
properties of the audio device. In that case, you can adjust the video and audio output
timing with the A/V sync setting.
Press the (Quick Settings) button on the remote control, and then select
the following in order.
[Settings] — [Display & Sound] — [Audio output] — [Audio system settings] — [A/V
sync] — [Auto] or [On]
Related topics
Adjusting the AV sync setting
Adjusting an audio system
[122] Sound | Sound
No TV sounds such as operation sound or audio
response.
If the TV is connected via eARC or [Digital audio output] is set to [Prioritize pass through],
TV sounds such as those from remote control operation or voice responses are not output