If the sensitivity of the headphones is 98 dB at 56 ohms, can they play louder than 100 dB? It is harmful for hearing from 90 dB, can I listen to them at 80% volume without serious harm to my hearing?
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Answer 1
January, 2021The sensitivity of headphones is indicated in different ways: it can be in decibels per volt, it can be in decibels per milliwatt.
An increase in power 10 times causes an increase in volume by 1 bel (10 decibels ). An increase in voltage 10 times causes an increase in current also 10 times and an increase in power 100 times - and loudness by 20 decibels.
But what about Volume "percent" is generally a dark topic. The volume control can be stupidly linear or logarithmic, which better corresponds to the subjective uniformity of loudness.
If 100% of the player produces the coveted calculated signal level, then the volume will be calculated.
In the case of a linear regulator - at 32% volume there will be a decrease in volume by 10 decibels.
In the case of a logarithmic regulator - it is even more confusing ...
Just be guided by ear.
Answer 2
January, 2021The sensitivity of headphones (and any other speaker system) is the level of sound pressure they create when a certain electrical signal is applied to them. There is no single standard here - different manufacturers measure according to different methods, at different frequencies, and often present the results in different units of measurement - some in dB / V, others in dB / W. Volts and watts, of course, are related to resistance through a formula from a school physics textbook - P = U * U / R, but the output resistance of the signal source also contributes to the resistance. In addition, the decibel is a logarithmic unit, an increase in sound pressure by 10 decibels corresponds to an increase of 10 times.
Simply - headphones with a sensitivity of 98dB / V when a 1V signal is applied to them will give out 98 dB, when applied to them 1.1V - 108dB.
Relax - most portable household devices like an iPhone or MP3 player do not output more than 0.3-0.5V at a low-impedance load. Just set a comfortable volume level without regard to the numbers published by the manufacturers.
For reference - 90db - jackhammer, 100dB - blacksmith shop, subway car, circular saw, 110dB - disco, rock concert, 120dB - pain threshold.