Sony SRS-X99 Help Manual page 290

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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.
What you can do with the speaker and 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,
remote control.
Note
If there is noise, turn off the iPhone/iPad/iPod once, then turn it on again.
The speaker supports only audio playback functions of an iPhone/iPad/iPod.
Do not connect a non-supported iPhone/iPad/iPod. Sony does not guarantee correct operation of a non-supported
iPhone/iPad/iPod.
Sony is not responsible for any loss or damage to data in an iPhone/iPad/iPod that is connected to the speaker.
Do not disconnect an iPhone/iPad/iPod during operation. To prevent damage to data, stop playback, then turn off the
power of the speaker before disconnecting the iPhone/iPad/iPod.
If sound is distorted, set the equalizer of your iPhone/iPad/iPod to "Off" or "Flat."
Turn on the power of the iPhone or iPod touch before connecting it to the speaker; otherwise, operation will not be
possible.
Depending on the connected iPhone/iPad/iPod, loud sound may suddenly be output when the volume is adjusted.
For details on operation of the iPhone/iPad/iPod, refer to its operation manual.
Related Topic
Parts and controls (Remote control)
Listening to music on a device via a USB connection (USB-A)
(Play/Pause) button, and
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/ (Previous/Next) button of the
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