Sony SRS-BTS50 - Manual (Page 97)

Check that the connected device is being played back.
Check that both plugs of the audio connecting cord are firmly inserted into the
system and the connected device.
If you are connecting a personal computer to the system, make sure the audio
output setting of the computer is set for a BLUETOOTH device.
Pair this system and the BLUETOOTH device again.
If the connected device is monaural, sound will only be output from the left
speaker.
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