How do I pair a Bluetooth speaker to the TV?
Switch on the Bluetooth device and place it within 5 meters of the TV. Press Quick settings > TV options > Settings > Remote & Accessories and press OK. Follow the on-screen instructions to pair the device with the TV. Once paired, the TV will store the connection and you don't need to pair it again unless you remove the device. Note: Many Bluetooth speakers have high latency which can cause audio to lag behind video.
From the official Sony TV manual, page 26
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