Sony SRS-X99 Help Manual page 215

5. Start playing back music on your smartphone/iPhone, and adjust the volume.
Music in the smartphone/iPhone will be heard from the speaker.
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.
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