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“…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
SoUND
NoISE LEVEL
(dB)
EFFECt
Whisper
30
Very quiet
Quiet Office
50-60
Comfortable hearing levels
are under 60 dB
Vacuum Cleaner, Hair Dryer
70
Intrusive; interferes with
telephone conversations
Food Blender
85-90
85 dB is the level
at which hearing
damage (8 hrs.) begins
Garbage Truck, Cement
Mixer
100
No more than 15 minutes
of unprotected exposure
recommended for sounds
between 90-100 dB
Power Saw, Drill/
Jackhammer
110
Regular exposure to sound
over 100 dB of more than
1 minute risks permanent
hearing loss
Rock Concerts (varies)
110-140
Threshold of pain begins
around 125dB
*Chart information obtained from http://www.nidcd.nih.gov/health/education/teachers/common_sounds.asp
