Sony SRS-X99 Help Manual page 243

The selected song will be heard from the speaker.
If playback does not start, perform the process again from step 3.
To enjoy a more dynamic sound
Remove the speaker grille from the front of the speaker with the speaker grille detach tool (supplied).*
*
Keep the removed grille on a flat surface to prevent distortion.
Note
Do not touch the exposed part of the speaker (speaker units) after removing the speaker grille.
Using the speaker or remote control during playback
You can adjust the volume using the VOL (volume) -/+ buttons of the speaker or the VOLUME +/- buttons of the remote
control.
You can also use the MUTING button,
control.
Hint
The procedure explained above is for guidance only. For details, refer to the operating instructions supplied with the
device.
After SongPal is downloaded and installed to your smartphone/iPhone, you can use it as a remote control to operate
devices connected to the speaker.
The volume level set by the VOL (volume) -/+ buttons of the speaker and that set in iTunes are synchronized.
For details on how to operate iTunes, refer to the help documentation of iTunes.
Note
Loud sound may be output from the speaker if you set the volume too high in iTunes.
In some cases, the volume level of iTunes might not synchronize with the volume level of the speaker.
Related Topic
Parts and controls (Remote control)
Using the BLUETOOTH/Network standby function
Listening to music on a device via a BLUETOOTH connection
(Play/Pause) button, or
4-567-508-11(1)
/ (Previous/Next) button of the remote
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