I. dynamic range
What is dynamic range? Headphone speaker manufacturers say that it refers to the sound pressure level difference between the strongest sound and the weakest sound emitted by the speaker under the specified non distortion index, and its measurement unit is dB. The wider the dynamic range, the better, because if your speaker's dynamic range is wider than others' speakers, the details of music that can't be heard on others' speakers can be shown in detail on your speaker. When the sound level is almost the same, it is an indisputable law that whoever has a wide dynamic range of speakers has a good sound effect.
II. Impedance
The nominal impedance of the horn refers to the impedance value presented at both ends of its voice coil when the horn is at a specific working frequency. When the horn operates on this impedance value, it can obtain the maximum power. The common impedance values of speakers mainly include 4, 5, 6, 8 and 16 Ω. When purchasing, pay attention that the impedance value of speakers should not be less than that of sound card or power amplifier, and both should be the same or greater than that of sound card. If you don't know the output impedance value of the sound card, you can also choose a speaker with an impedance of 8 Ω, which has the widest adaptability.
Third, pure tone
Pure tone is also one of the important indicators to judge the quality of speakers. Pure sound refers to adding a positive signal of a certain frequency to the horn within the range of rated power and rated frequency. The horn shall be free of mechanical noise, ring touching sound and garbage sound. Especially for those loudspeakers produced by small factories or workshops with rough workmanship, it is a common phenomenon to produce impure timbre. We should pay attention to it when purchasing. The playback quality of loudspeakers with this quality must be poor. The reason for the poor pure tone is the poor workmanship of the horn, such as the edge pressing of the paper basin and the poor adhesion of the centering support; The magnetic guide plate of the basin frame is not firmly connected; The voice coil and dust cover are not firmly bonded; The voice coil is deformed and placed incorrectly; There are iron filings or dust in the magnetic gap.
Fourth, distortion
Refers to nonlinear distortion. It is divided into harmonic distortion, intermodulation distortion and transient intermodulation distortion. Harmonic distortion refers to the distortion caused by the addition of high-order harmonic components not found in the original signal in sound playback, so harmonic distortion mainly occurs at low frequencies, especially at resonance frequencies. Intermodulation distortion mainly affects the tone of sound.
Transient intermodulation distortion refers to the transient intermodulation distortion caused by the instantaneous overload of the input stage due to the delay of negative feedback caused by the compensation capacitor introduced in the low-frequency amplification or power amplifier stage when the amplifier inputs the pulse signal, which will seriously affect the sound restoration and playback quality. Therefore, it is more important in speaker and speaker system. Its index is closely related to the quality of speaker. It is 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.
V. nominal power
The manufacturer of Shengchang electronics introduces what is the nominal power. The nominal power is the rated power. It is the normal working power of the horn. The horn will not be damaged only if it works for a long time under this condition. This involves a problem of maximum input peak power [maximum allowable input power], which refers to the maximum power that the horn can bear. Due to the different definitions and standards of power in various countries and major audio manufacturers, these values are very different. When purchasing, you should pay attention to that according to China's regulations, the maximum power of the horn cannot exceed 1-2 times its nominal power. However, some imported speakers are not necessarily like this. In addition, some manufacturers like to mark the peak power as the rated power on the speaker. We must not believe it. The "so-called" rated power of 300W and 500W is great if it can reach 10W. In addition, the nominal power value of the selected speaker should not be seriously less than the output power of the sound card or power amplifier.
Vi. frequency response
When a constant voltage is applied to the input of the horn, the sound pressure level at a certain point in the axial direction of the horn will change with the frequency, which is called the frequency response. It is an important indicator of the speaker. If you press the horn, the frequency range of the low-frequency horn is usually 20hz-3000hz; The frequency range of intermediate frequency horn is 500hz-5000hz, while the frequency range of high frequency horn is 3000hz-20000hz. However, it does not mean that the speaker can achieve such frequency response, and the speaker will have such frequency response index, which has a great relationship with the quality of the speaker, the workmanship and materials of the speaker. Nowadays, an excellent speaker has a frequency response range of 60hz-20000hz. As for some low-grade speakers, it is difficult to reach the above nominal value. Don't be credulous when purchasing.
For more information, please visit Dongguan Shengchang electronic official website or consult 13559793345. Shengchang electronics focuses on the production and R & D of buzzer and atomizer products, and is always committed to building safe, stable and certified products in line with national standards.