“…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
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