Tuesday, October 24, 2006

iPods - Safe Tech Tips


This week is the Apple iPod's fifth year anniversary. I can't turn a corner without bumping into one of the 68 million people using this sleek MP3 player. It's a great device that provides music, keeps the peace between teens and adults, makes those long road trips tolerable, and keeps me sane when I travel. But how long and how loudly can you listen to an iPod safely?

A recent study was published that gives some guidelines for safe listening. The researchers, Cory Portnuff and Brian Fligor studied 5 MP3 players with 5 models of earphones with each player and with different types of music.

"Typical individuals can tolerate about two hours a day of a decibel unit known as 91-dBA before risking hearing loss, Portnuff said. The term dBA stands for "A-weighted decibels, a scale that takes into account that the human ear has different sensitivities to different frequency levels," he said".

The table below is their recommendation for maximum listening time with different earphones without damaging the hearing. **There was no difference in the genres of music or the MP3 players**. It's really all about volume control and how long you spend listening. Please note that these are just general guidelines. Some people have more sensitive ears than others.
Maximum Listening Time Per Day

% of Volume ControlEarbudIsolatorSupra-Auralstock earphones
10 - 50 %No limitNo limitNo limitNo limit
60 %No limit14 hoursNo limit18 hours
70 %6 hours3.4 hours20 hours4.6 hours
80 %1.5 hours50 minutes4.9 hours1.2 hours
90 %22 minutes12 minutes1.2 hours18 minutes
100 %5 minutes3 minutes18 minutes5 minutes

Table 1. Maximum listening time per day using NIOSH damage-risk criteria. “Earbud” includes stock earphones and iPod In-ear earphones. “Isolator” includes Etymotic ER6i earphones and Shure E4c earphones. “Supra-Aural” includes Koss headphones that rest on top of the ear. ©2006 Cory D.F. Portnuff, B.S. and Brian J. Fligor, Sc.D.

Bottomline is that if you are going to listen to the MP3 player for an extended period of time then it seems safest to play it at a level of less than 70% of the volume. Above the 80% volume damage to the hearing could be done fairly rapidly. Similar findings were found in a study of personal stereo systems.

References: please see specific links.
Photo: courtesy of ipodlounge

7 comments:

Discount-Shopping said...

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Regards
Chr. Schmidt

Joan said...
This comment has been removed by a blog administrator.
Joan said...

The ipod Changed the Music Insdustry it was a great move from Apple. Two thumps up

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Mike said...

ipods are the latest technology. It does have safety features included. Listening a walkman or pocket cd/cassete player than listening to ipods are more safer. I see the table here and it does show it's effectiveness

Anonymous said...

I throw mine.

PHORA-HR / SF-HR

seyma said...

thanks all information

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ahmet can said...

Thanks Best Regards
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