It is a bluetooth thing. If you try to play sound from the tablet to speaker when outside and there is no delay… then it could be signal issue in the room.
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I am watching YouTube from PC - USB Bluetooth dongle - JBL Clip 2. I see the mouth move on the singer before I hear the sound. Some times its perfect, some times I have to restart YouTube or the PC.
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I think its a JBL issue as this has happened before on different name brand Bluetooth dongle.
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It is very hard to tell you how to fix your tablet sound delay to speaker.
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It could be a driver issue with the bluetooth radio in the tablet. It could be the Bluetooth board in the speaker, Signal issues…. There are a few issues.
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I would try a different speaker. Go to the store and connect the tablet on a different speaker to see if there is delay.
I have experienced this delay on JBL speakers.
It is a bluetooth thing. If you try to play sound from the tablet to speaker when outside and there is no delay… then it could be signal issue in the room.