Views: 0 Author: Site Editor Publish Time: 2021-12-28 Origin: Site
Basic Knowledge of HiFi Speakers
With the improvement of living standards, more and more Hi-Fi products enter people's lives, and people are willing to spend more time and money to enhance the enjoyment of hearing. Many people have this question: Why is HiFi so expensive? The same sound comes out from the speakers, why is the sound of the HiFi speaker different? In fact, playing audio is far from as simple as it seems. Some of the most basic parameter terms, sounding units and types of audio are already dizzying. First understand the basic knowledge of HiFi speakers, and under the guidance of this knowledge, you can probably know why HiFi speakers are so different, so enthusiasts can't stop.
The first is the frequency range, which refers to the range from the lowest effective reproducing frequency to the highest effective reproducing frequency. We know that the most ideal audible frequency range for the human ear is 20HZ~20000HZ. In order to achieve this goal, a speaker must consider a structure that withstands large amplitude and reduce distortion. Generally, it is necessary to increase the volume of the speaker.
The second is the frequency response of the speaker, which refers to the connection of a constant voltage output audio signal to the speaker system. When the frequency of the audio signal is changed, the sound pressure generated by the speaker increases or attenuates and the phase lag changes with the frequency. The phenomenon of change, the corresponding change relationship between sound pressure and phase and frequency is called frequency response. The amount of change is expressed in decibels (dB). This indicator is an important indicator for assessing the quality of speakers. The smaller the decibel value, the flatter the frequency response curve of the speaker and the smaller the distortion.
When it comes to distortion, there are generally three types: harmonic distortion, intermodulation distortion, and transient distortion. Harmonic distortion refers to the addition of high-order harmonic components that are not in the original signal to the reproduced sound.
Intermodulation distortion is a new frequency component that is not in the original signal due to the non-uniformity of the magnetic field of the magnetic gap and the nonlinear deformation factor of the support system during the process of reproducing the sound source of the speaker. When added to the speaker together with the original frequency signal, it will be modulated to produce another new frequency. Therefore, in addition to the original signal, there are two new frequencies that are not in the original signal. This distortion It is intermodulation distortion.
The transient distortion of the speaker system refers to a kind of transmission waveform distortion caused by the mass inertia of the speaker vibration system. Because the speaker has a certain mass inertia, the vibration of the paper cone cannot keep up with the instantaneous change of the electrical signal, which causes the distortion of the transmission waveform of the reproduced sound, resulting in the change of the frequency spectrum and the tone. The quality of this index is extremely important in the speaker system and speaker unit, and it directly affects the sound quality and the degree of tone reproduction.
There is also the impedance and sensitivity of the speaker. Impedance refers to the ratio of the signal voltage input by the speaker to the signal current. The preferred values of speaker impedance specified by our national standards are 4Ω, 8Ω, 16Ω (the recommended value of international standards is 8Ω). The nominal impedance of the speaker is different from the nominal impedance of the speaker because there is more than one speaker unit in the The nature is not all the same.
The sensitivity of a speaker refers to the sound pressure level measured at a distance of 1m from the geometric center of each speaker unit on the front of the speaker when the input power to the speakers in the speaker system is 1W. What needs to be pointed out here is that although sensitivity is an indicator of the speaker, it has nothing to do with the sound quality and tone. It only affects the loudness of the speaker. You can increase the input power to increase the loudness of the speaker.
Written by: Davecl Audio
More would be continued in next article.
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