Apple iPhone iOS 8.4 - Manual (Page 77)

Chapter 8 Music 77
Note: The Late Night setting compresses the dynamic range of the audio output, reducing the
volume of loud passages and increasing the volume of quiet passages. You might want to use
this setting when listening to music on an airplane or in some other noisy environment. (The
Late Night setting applies to all audio output—video as well as music.)
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Volume Limit: In some European Union (EU) countries, iPhone may indicate when you’re
setting the volume above the EU-recommended level for hearing safety. To increase the
volume beyond this level, you may need to briefly release the volume control. To limit the
maximum headset volume to this level, go to Settings > Music > Volume Limit, then turn on
EU Volume Limit.
Note: To prevent changes to the volume limit, go to Settings > General > Restrictions > Volume
Limit, then tap Don’t Allow Changes.
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Sound Check: Sound Check normalizes the volume level of your audio content.