Sony SRS-X99 Help Manual page 284

When the playback quality setting is changed by using Songpal while the speaker is turned on, the BLUETOOTH
connection is terminated. In this case, connect the BLUETOOTH device manually again. After reconnecting, the
playback quality is switched.
You may also need to adjust the settings of the connected device to change the playback quality setting, such as
SBC, AAC, LDAC. For details, refer to the operating instructions supplied with the device.
Related Topic
Using the BLUETOOTH/Network standby function
Setting the BLUETOOTH audio streaming playback quality (Codec)
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