長時間戴耳機聽音樂，會對耳朵造成傷害，已經是眾所皆知的事。但到底聽多大聲的音樂、聽多久，才容易傷害耳朵呢？本文末、相關資料1.中推薦閱讀的一篇文章"Listen Safely: Your Ears and Your iPod“(來自iLounge)，摘錄重點如下：
The Occupational Safety and Health Administration (OSHA) has provided safety guidelines for people working in noisy areas, and suggests that every 5 dB increase in volume cuts the maximum permissible exposure time in half. Under OSHA standards, workers can only be exposed to 90 dB for 8 hours per day, 95 dB for 4 hours, 100 dB for 2 hours, and so on. While many hearing professionals say these guidelines are not strict enough, they make it clear that, to protect your ears, you should carefully limit the amount of time you spend listening to your iPod at high volumes.
- 以 iPod 為例，建議盡量調為 40 % 以下的音量。
Except for in Europe, the iPod’s maximum output level is 130 decibels, and most music files stored on your iPod will be between 95 and 105 decibels…While a half-hour at high (80%) volume will not likely harm your ears, assuming that you give them time to rest before the next listening session, we’d recommend that you don’t turn your iPod up anywhere near this or its top volumes when using Apple’s included buds, or most others you might attach instead. Even at the iPod’s medium (50%) volume level, listening for several hours at a time, over long periods, may lead to hearing damage. We’d strongly recommend that you listen at the 40% or below level with headphones attached whenever possible.
The most dangerous parts – sudden spikes in volume – can cause instant damage.
In fact, many classical musicians now wear earplugs that reduce the volume of sound without deforming it.
Most commonly, hearing problems begin as a ringing in the ears, or a feeling of fullness as though the ears are clogged.
If you listen in a quiet area, such as at home or walking in a park, you won’t need to turn the volume up very loud. But get on the subway, or walk along a noisy street, and you’ll instinctively crank it up to ensure that it is louder than the ambient noise you are trying to tune out. And that’s where the trouble begins. When music competes with other loud sounds, you lose perspective, and no longer realize just how loud the volume is; you just keep turning it up so you can hear the quiet parts.