Samsung SWC-R640LBAXAR - Manual (Page 210)

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Responsible Listening
Caution!: Avoid potential hearing loss.
Damage to hearing occurs when a person is exposed to loud sounds
over time. The risk of hearing loss increases as sound is played
louder and for longer durations. Prolonged exposure to loud sounds
(including music) is the most common cause of preventable hearing
loss. Some scientific research suggests that using portable audio
devices, such as portable music players and cell phones, at high
volume settings for long durations may lead to permanent noise-
induced hearing loss. This includes the use of headphones (including
headsets, earbuds, and Bluetooth® or other wireless devices).
Exposure to very loud sound has also been associated in some
studies with tinnitus (a ringing in the ear), hypersensitivity to sound,
and distorted hearing. Individual susceptibility to noise-induced
hearing loss and potential hearing problem varies. Additionally, the
amount of sound produced by a portable audio device varies
depending on the nature of the sound, the device settings, and the
headphones that are used. As a result, there is no single volume
setting that is appropriate for everyone or for every combination of
sound, settings, and equipment.