The frequency range of sound waves that the human ear can generally feel is 20-20000 Hz. Hearing is sensitive to sound wave frequency of 500- 1000 Hz and insensitive to noise of 2000-4000 Hz. Long-term use of headphones will damage hearing in high-frequency sound waves (2000-4000 Hz).
When the volume exceeds 85 decibels, it will cause hearing fatigue after a long time; When the volume is as high as 1 10 dB, it will cause irreversible hearing damage in severe cases. The volume output of headphones is generally about 84 decibels, and some high-frequency ranges can reach 120 decibels, which has a great impact on listening.
Extended data
Use headphones correctly
1. Use the "60-60" principle-an internationally recognized method to protect hearing.
WHO recommends that when using headphones, the volume should generally not exceed 60% of the maximum volume, and it is best to turn it down to avoid excessive irritation to the ears; It's safer not to exceed 60 minutes every day, so everyone should wear less headphones and listen intermittently to give their ears a full rest.
2. Pay attention to the use environment of headphones.
In a noisy environment, if you wear headphones, you will unconsciously increase the volume, so if the external noise is loud, try not to wear headphones.
3. It is not recommended to sleep and listen to headphones.
When sleeping, if the ear wearing headphones is pressed on the pillow, it will damage the auricle and aggravate the stimulation to the tympanic membrane. At the same time, if you don't take off your headphones when you sleep, you will wear them for a long time.
4. For people who wear headphones for a long time, it is recommended to choose headphones.
In-ear headphones have small sound contact area and great pressure on cochlea; The contact area of earphone is large, the pressure is low, and the stimulation to cochlear cilia cells is relatively small and safer.
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