How to see the basic form and parameters of the headset?

Mar 01 - 2022


frequency response

Full name: frequency response. When an audio signal output at a constant voltage is connected to the system, the sound pressure generated by the headphones increases or decreases with frequency, and the phase changes with frequency. This dependence of sound pressure and phase on frequency is called the frequency response. Indicates the development of a headset's response to a signal. The value of this question is a reasonable range. The larger the range,noise cancelling earbuds and earphones, the better. Even if it does not exceed the students' listening range, the sound field will be shaped in other ways.

Supplementary note: This parameter is actually a bit virtual. For example, the famous Sony e888 is its unique biological diaphragm that achieves a large frequency response range, but how much effect does it actually have? Hard to pull. The soundstage is thick enough to have some.


The impedance of the earphone is short for its AC impedance, and the unit is ohm (Ω). Generally speaking, the smaller the impedance, the easier the earphone is to make noise and drive (commonly known as good push). The impedance of the headphone changes with the frequency of the audio signal it is replaying. Generally, the impedance of the headphone is the largest at low frequencies. Headphones with different impedances are mainly used in different occasions. On desktops or power amplifiers, VCDs, DVDs, TVs and other equipment, high-impedance headphones are commonly used, and some professional headphones have an impedance of more than 200 ohms. For various portable players, such as CD, MD or Mp3, low-impedance headphones are generally used because these low-impedance headphones are easier to drive. So the size of the impedance has nothing to do with the sound quality of the headphones. Of course, headphones with higher impedance within a certain limit have better sound effects when paired with a sound source with high output power.


The sensitivity of the earphone is actually the sensitivity level of the earphone. It is the sound pressure level generated by the earphone coupled to the artificial ear (dummy head) when the electric power of 1mW is applied to the earphone. The power of 1mW is the frequency. The standard impedance of the headphones at 1000Hz is calculated based on. The word can be difficult to understand, simply high sensitivity means less power to reach a certain sound pressure level, so "the more sensitive the earphone, the more suitable for any device." For HIFI offensive and defensive use or use a desktop system In other words, the greater the sensitivity, the greater the noise you hear (the noise produced by the current) (called the noise floor in portable electronic digital).

Harmonic Distortion

Harmonic distortion refers to the information distortion that occurs when the Chinese earphones replay the sound due to the phenomenon of affecting the resonance during the development of the earphone. (Many different manufacturers have begun to change the earphone material to minimize the resonance phenomenon.) Although only the fundamental frequency signal processing in the earphone is the original social signal of the sound, the resonance phenomenon (in the original sound wave) will inevitably occur due to development. On the basis of continuous generation of second, third and even multiple harmonics), the sound control signal is no longer because only the fundamental frequency signal, but also includes the harmonic analysis and its frequency multiplication components, these frequency multiplication signals will lead to The information is distorted when the headphone is playing. Then there is total harmonic distortion, which refers to the extra harmonic components in the output signal (harmonics and their multipliers) that are more than the input signal when the signal source is used for the input, usually expressed as a percentage. Generally speaking, the total harmonic distortion at the frequency of 1000Hz is the smallest, so many headphone products use this frequency distortion as an indicator. Therefore, when testing the total harmonic distortion, it is to emit a sound of 1000Hz to detect, the smaller the value, the better.