Automatic volume limiter

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An Automatic volume limiter (AVL) is an option that limits the maximum volume level and is enabled through software or hardware in Portable media player music players as well as cassette players,[1] CD players or other devices used with headphones such as the Sony PSP. The aim of this feature is to stop the headphones drowning out all other noise, and to limit the noise from the headphones being heard by other people.[2] It can also prevent listeners from damaging their hearing. This volume limit can be set by the manufacturer or customized by the user.

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