Beats by Dr Dre powerbeats Manual - Page 3

SOUND NOISE LEVEL (dB) EFFECT Whisper 30 Very quiet Quiet Office 50-60 Comfortable hearing levels are under 60 dB Vacuum Cleaner, Hair 70 Dryer Intrusive; interferes with telephone conversations Food Blender 85-90 85 dB is the level at which hearing damage (8 hrs.) begins Garbage Truck, 100 Cement Mixer No more than 15 minutes of unprotected exposure recommended for sounds between 90-100 dB Power Saw, Drill/ 110 Jackhammer 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 2 "...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 3