Bluetooth delay with Mars 2 nebula 500 pro

Mars 2 nebula 500 pro getting delay with Bluetooth speaker when HDMI linked to my iPhone x. I see this with the Amazon prime app. Is there a way to resolve this?

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Workaround?

How bad is the delay?

About a second. Only when I connect hdmi to iPhone then to Bluetooth speaker.

Enough to throw the movie off.