Dongguan Sheng Chang Electronic Technology Co., Ltd.


Years of focus
Buzzer / atomizer products


  First. Dynamic range
   What is the dynamic range? For the headphone speaker manufacturer, it refers to the sound pressure level difference between the strongest sound and the weakest sound emitted by the speaker in the case of the specified non-distortion index, and the unit of measurement is dB. The wider the dynamic range, the better, because if your speakers have a wider dynamic range than others, then the details of the music you can't hear on other speakers can be detailed on your speakers. When the sound level is similar, the dynamic range of the speaker is wide, and the sound effect is good. This is an indisputable law.
   Second. Impedance
   The nominal impedance of a horn is the impedance value exhibited by the horn at both ends of its voice coil at a particular operating frequency. The horn can obtain maximum power when operating at this impedance value. The impedance values of the speakers are usually 4, 5, 6, 8, 16 and so on. When purchasing, pay attention to the impedance of the speaker should not be less than the impedance of the sound card or amplifier. The two should be the same or larger than the sound card. If you don't understand the output impedance of the sound card, you can also use a speaker with an impedance of 8 ohms. It has the widest adaptability.
   Third. Pure tone
   Pure tone is also one of the important indicators to judge the quality of the speaker. Pure tone means that the horn is added with a positive frequency signal of a certain frequency within the rated power and rated frequency range. The horn should have no mechanical noise, ringing sound and garbage sound. Especially for those small factories or small workshops that produce rough work, it is a common phenomenon that the sound is not pure. Everyone needs to pay attention to the purchase. The quality of the speakers is not good. . The reason for the poor pure tone is that the work of the speaker is not good. For example, if the paper cone is pressed, the centering piece is not firmly bonded; the magnetic plate of the basin frame is not firmly connected; the voice coil and the dust cover are not firmly bonded; the voice coil is deformed. , the placement is not correct; there are iron filings or dust in the magnetic gap.
   Fourth. Distortion
   Refers to nonlinear distortion. It is divided into three categories: harmonic distortion, intermodulation distortion and transient intermodulation distortion. Among them, harmonic distortion refers to the distortion caused by the higher harmonic components of the original signal, so the harmonic distortion is mainly generated at low frequencies, especially at the resonance frequency. The intermodulation distortion mainly affects the tonal aspect of the sound.
   Transient intermodulation distortion refers to the compensation capacitor introduced in the low-frequency amplification or power amplifier stage. When the amplifier inputs the pulse signal, the negative feedback is delayed due to the capacitor, so that the input stage is instantaneously overloaded to generate transient intermodulation distortion. Seriously affects the sound reproduction playback quality. Therefore, it is more important in the speaker and speaker system, and its indicators are closely related to the quality of the speaker. Often expressed as a percentage, the smaller the value, the smaller the distortion. The distortion of ordinary speakers should generally be less than 0.5 percentage points, while speakers such as subwoofers should be less than 5 percentage points.
   Fifth. Nominal power
   The sound electronic manufacturer introduces what is the nominal power, the nominal power is the rated power, it is the normal working power of the speaker, the speaker can only be damaged if it is working under this condition for a long time. This involves a maximum input peak power [maximum allowable input power] problem, which refers to the maximum power that the speaker can withstand. Since countries and major audio manufacturers have different definitions and standards for power, these values are very different. Everyone should pay attention to the purchase. According to China's regulations, the maximum power of the speaker cannot exceed 1-2 of its nominal power. Times. However, some imported speakers are not necessarily the case. There are also some manufacturers who like to use the peak power as the rated power in the speaker, we must not believe it, its "nominal" 300W, 500W rated power value, if it can reach 10W, it is very great. Also, the nominal power value of the selected speaker should not be significantly less than the output power of the sound card or amplifier.
   Sixth. Frequency response
   When a constant voltage is applied to the input end of the horn, the relationship between the sound pressure level at a certain point in the axial direction of the horn and the frequency change is called the frequency response. It is an important indicator of the speaker. If the speaker is divided, the frequency range of the low frequency speaker is usually between 20Hz and 3000Hz; the frequency range of the intermediate frequency speaker is between 500Hz and 5000Hz, and the frequency range of the high frequency speaker is 3000Hz. Between 20000Hz. But it is not that the speaker can achieve such a frequency response, the speaker will have such a frequency response indicator, and the quality of the speaker, the speaker's workmanship and materials have a large light system. Today's excellent speakers have a frequency response range of typically between 60Hz and 20,000Hz. As for some low-end speakers, it is difficult to achieve the above nominal value, so don't trust when you buy.
   For more information, please visit Dongguan Shengchang Electronic official website, or consult 13559793345. Shengchang Electronics focuses on the production and research and development of buzzer and atomized sheet products, and always strives to create products that are safe, stable and meet the national standard certification.