Panasonic TX-65MZ2000B Ehelp page 292

When a Bluetooth device is connected to the TV, it is possible that the
●
Bluetooth audio output may not be synchronised (i.e. be delayed) with
relation to the images on the screen. This is not a defect of the TV or the
device. The delay time will differ depending on the device.
When using two audio devices simultaneously, set
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connect the second Bluetooth device. There may be a lag between the
sounds of the connected Bluetooth devices while
And the volume of the Bluetooth device cannot be adjusted when the
Bluetooth audio device without the absolute volume feature is already
connected.
Dual Audio
Dual Audio
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to On and
is set to On.