Sony SRS-XB21 Help Manual page 37

3.
Tap [Settings] – [Other Settings] – [Bluetooth Codec], and then select a codec.
[AUTO]: Priority on sound quality
[SBC]: Priority on stable connection
Note
Noise or sound interruption may occur in the [AUTO] (Priority on sound quality) mode, depending on the setting of your
BLUETOOTH device and ambient conditions. In this case, change the speaker to the [SBC] (Priority on stable connection) mode.
Related Topic
Using the BLUETOOTH standby function
What you can do with "Sony | Music Center"
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