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Les langues disponibles
SOUND
NOISE LEVEL
(dB)
Whisper
30
Quiet Office
50-60
Vacuum Cleaner, Hair
70
Dryer
Food Blender
85-90
Garbage Truck,
100
Cement Mixer
Power Saw, Drill/
110
Jackhammer
Rock Concerts (varies)
110-140
*Chart information obtained from http://www.nidcd.nih.gov/health/education/teachers/common_sounds.asp
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EFFECT
Very quiet
Comfortable hearing
levels are under 60 dB
Intrusive; interferes
with telephone
conversations
85 dB is the level at
which hearing damage
(8 hrs.) begins
No more than
15 minutes of
unprotected exposure
recommended for
sounds between
90-100 dB
Regular exposure to
sound over 100 dB of
more than 1 minute risks
permanent hearing loss
Threshold of pain begins
around 125 dB
"... a typical person can safely listen to an iPod for 4.6 hours per day at 70% volume."
"... knowing the levels one is listening to music at, and for how long
is extremely important."
From http://www.cbc.ca/health/story/2006/10/19/music-earphones.html
Get the most out of your equipment and enjoy great audio performance even
at safe levels. Our headphones will allow you to hear more details at lower
volume levels than ever before.
Physiology of the Ear and Hearing
For additional information on what loud noises do to your ear and chart reference
http://www.abelard.org/hear/hear.php#loud-music
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