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ENGLISH
SoUND
NoISE LEVEL
(dB)
Whisper
30
Quiet Office
50-60
Vacuum Cleaner, Hair Dryer
70
Food Blender
85-90
Garbage Truck, Cement
100
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 125dB
ENGLISH
"...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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