Distortion And Frequency Response Of Headphones
Dec 05, 2022| Distortion:
The distortion of earphones is generally very small. The total harmonic distortion (THD) of earphones is less than or equal to 1% at the maximum power, which is basically inaudible and much smaller than that of loudspeakers.
Frequency Response:
The sensitivity has different values at different frequencies, which is called frequency response. The dependence of sensitivity on frequency is expressed by a curve, which is called frequency response curve. The human hearing range is 20Hz-2000Hz. The voice beyond this range is inaudible to most people. The frequency band that earphones can reproduce is quite wide. Excellent earphones can already reach 5Hz-45000Hz.
The unevenness of the frequency response given by general earphones is plus or minus 10dB, and that given by professional earphones and some high-end earphones is plus or minus 3dB. This has caused the phenomenon that many middle and low-end earphones have amazing frequency responses and high-end earphones have flat frequency responses. A headset with a truly straight frequency response curve will not have a good sound, because the sound has already interacted with the head to produce peaks and valleys before entering the ear canal. Therefore, a balanced method is often used in the design of the headset to make the frequency response curve received by the ear more flat.