Default volume limit and personal media players: the effect of background noise on preferred volume using an iPod.
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This study aims to determine the practicalities of the latest EU-imposed 85dB personal media
player (PMP) volume limit by testing it in a simulated real-life situation to establish the effects
of background noise on subjects' preferred volume level.
A systematic literature search was carried out using several widely used databases and the
information most pertinent to the present study was included in the review. Subjects would
listen to a chosen song on a 85dB-volume-limited Apple iPod Touch using stock in-concha Apple
iPod earphones. Two types of environmental background noise would be presented separately
through a sound-field and gradually increased until subjects indicated they would typically
increase their PMP volume above the 85dB volume limit.
The study would be a test of how the 85dB default volume limit would perform when put into
practice in two typical real-life noisy scenarios. While the default volume limit is a safety
measure that may allow for safer music-listening for most PMP users, it can be over-ridden. This
study aims to establish the level at which background noise disturbs music-listening of PMP
users and potentially leads them to take action to over-ride a default volume limit setting. It does
not aim to come to any conclusions regarding the determination of risk of NIHL.