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The absolute threshold of hearing is the minimum sound level of a pure tone that an average human ear can hear. It is frequency-dependent and reaches as low as -9 dB SPL at 2-5 kHz.
And while over-the-ear headphones can help close off more outside noise (than earbuds), it’s still important to keep the maximum volume at 70% or less to maintain hearing health. __wf_reserved ...
It specified a maximum output sound pressure level of 120 dB SPL. In 2019, the ITU published standard ITU-T H.871 [ 50 ] called "Safe listening guidelines for personal sound amplifiers". This standard recommends that PSAPs measure the weekly sound dose and adhere to a weekly maximum of less than 80 dBA for 40 hours.
Sound pressure is the local deviation from the ambient pressure caused by a sound wave. Sound pressure level is a logarithmic measure of the effective pressure relative to a reference value, and it can be calculated using the formula Lp = 20 log (p/p0).
An equal-loudness contour is a measure of sound pressure level for which a listener perceives a constant loudness. The human ear is most sensitive between 2 and 5 kHz, and the ISO standard curves reflect this and other factors.
The human hearing range is commonly given as 20 to 20,000 Hz, but varies with age and individual. Some animals, such as dolphins, bats, elephants and whales, can hear much higher or lower frequencies than humans.
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