Headphones are an indispensable accessory in our lives. Whether on the commute, in the gym, or in the school study room, we all need headphones to immerse ourselves in our world. So almost everyone has a pair of headphones, do you really think good or bad?
How to see the good and bad of the headset, the benevolent sees the benevolence, the wise sees the wisdom. In terms of comfort and sound quality alone, the range is too large, and almost many big-name headphones have these characteristics, but the ears are believable! It is recommended to try it out for yourself, otherwise you may be disappointed after buying it. When choosing a headset, we will also be affected by some terminology parameter confusion and the noisy environment of the store, so the following summary has made a few parameter indicators, hoping to help you buy a reference.
1. Signal-to-noise ratio
It is the ratio of the output signal power of the amplifier to the noise power output at the same time, often expressed in decibels. Generally speaking, the larger the signal-to-noise ratio, the smaller the noise mixed in the signal and the higher the sound quality of the sound playback. Otherwise, the opposite is true. The signal-to-noise ratio should generally not be lower than 70dB.
2. Headphone sensitivity
It refers to the sound pressure level that the earphone can emit when the power of 1 milliwatt is input to the earphone (the unit of sound pressure is decibels, the greater the sound pressure, the greater the volume), so generally the higher the sensitivity and the lower the impedance, the easier the earphone The louder, the easier it is to drive. The higher the sensitivity, the lower the power required to reach a certain sound pressure level. Nowadays, the sensitivity of dynamic monitor-level headphones is generally above 90dB/mW. If you choose headphones for a walkman, the sensitivity is best to be 100dB/mW. Around or higher.
3. Frequency response
Refers to the phenomenon that when an audio signal output with a constant voltage is connected to the system, the sound pressure generated by the speaker increases or attenuates with the change of the frequency, and the phase changes with the frequency. This kind of sound pressure and phase and frequency The associated change relationship is called frequency response. The human hearing range is 20Hz-20000Hz. Most people can't hear the sound beyond this range, but the frequency band that the earphone can reproduce is quite wide. Excellent earphones can reach 5Hz-45000Hz, and the price is Higher.
4. Total harmonic distortion
Total harmonic distortion is related to frequency. Generally speaking, the total harmonic distortion at a frequency of 1000 Hz is the smallest, so many products use the distortion of this frequency as its indicator. The total harmonic distortion is less than 1%, and the general ear cannot distinguish it. If it exceeds 10%, the distortion component can be clearly heard. The smaller the value of this total harmonic distortion, the purer the sound. The total harmonic distortion of general products is less than 1%@1000Hz, but the smaller the value, the higher the quality of the product.