Sony SRS-X99 Help Manual page 278

When you turn on the speaker or tap the
BLUETOOTH connection with the last connected BLUETOOTH device. If the device's BLUETOOTH function is on,
the BLUETOOTH connection is started automatically.
When the BLUETOOTH/Network standby function is turned on, the speaker turns on automatically by operating a
BLUETOOTH device, and starts the BLUETOOTH connection.
Note
Stop playback on the BLUETOOTH device and turn down the volume of the device beforehand. Otherwise, you may
experience sudden loud sound output from the speaker when music is played back for the first time after a
BLUETOOTH connection has been made.
If the speaker tries to reconnect with the last connected BLUETOOTH device, the connection may fail. In this case,
terminate the BLUETOOTH connection by operating the connected BLUETOOTH device.
Related Topic
Using the BLUETOOTH/Network standby function
Listening to music on a device via a BLUETOOTH connection
(BLUETOOTH) PAIRING button, the speaker tries to make a
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