The speaker is also known as the speaker system, which is an extremely important part of the sound system. Because the playback quality of the speaker has a great impact on the entire sound system. At present, the level of program signal source equipment and power amplifier has been very high, so a sound system composed of high-quality sound source, high-quality amplifier and speaker system, its playback quality mainly depends on the speaker.

The type of speaker

There are many ways to classify speakers, and the common classifications in professional audio are as follows:

1. According to the use of the occasion: divided into two categories: professional speakers and home speakers. Household speakers are generally used for home playback, which is characterized by delicate and soft sound quality, more delicate and beautiful appearance, and the sound pressure level is not too high, and the power it bears is relatively small. Professional speakers are generally used in professional entertainment venues such as song and dance halls, karaoke halls, theaters, halls and stadiums. Generally, the sensitivity of professional speakers is higher, the sound pressure is high, the strength is good, and the power is large, compared with household speakers, its sound quality is hard, and the appearance is not very exquisite. However, the performance of the monitors in professional speakers is close to that of home speakers, and the appearance is generally more delicate and small, so this kind of monitor is also often used in home Hi-Fi sound systems.

2. According to the frequency of playback: it can be divided into full-range speakers, subwoofers and subwoofers. The so-called full-band speaker refers to a speaker that can cover the low-frequency, mid-frequency and high-frequency range. The lower frequency of the full-band speaker is generally 30Hz-60Hz, and the upper frequency is 15KHz-20KHz. In the general small and medium-sized audio system, only one or two pairs of full-range speakers can be used to fully undertake the task of playback. Subwoofers and subwoofers are generally special speakers used to supplement the low-frequency and subwoofer playback of full-range speakers. This type of speaker is generally used in large and medium-sized audio systems to enhance the intensity and shock of low-frequency playback. When used, most of them pass through an electronic crossover (crossover) to send the low-frequency signal to a special bass amplifier, and then push the bass or subwoofer.

3. According to the use: it can generally be divided into the main amplifier speaker. monitors and monitors, etc. The main speaker is generally used as the main speaker of the sound system and undertakes the main sound playback task. The performance of the main speaker has a great impact on the playback quality of the entire audio system, and the full-band speaker and subwoofer can also be selected for combined playback.

The monitor is used in the control room and recording studio for program monitoring, and it has the characteristics of small distortion, wide and straight frequency response, and little modification of the signal, so it can most truly reproduce the original appearance of the program. Monitors, also known as stage monitors, are generally used on stages or dance halls for actors or band members to monitor their singing or playing sounds. This is because they are located behind the main loudspeakers on the stage, and they cannot hear their own voice or the sound of the band playing clearly, so they cannot cooperate well or find the feeling inaccurately, which seriously affects the performance effect. Generally, the listener is made into an inclined shape and placed on the ground, so that it can not only be placed on the stage without affecting the overall shape of the stage, but also can be heard clearly by the people on the stage when playing the sound, and will not feed the sound back to the microphone and cause whistling sound.

4. According to the cabinet structure: it can be divided into sealed speakers, inverted speakers, labyrinth speakers, sound wave tube speakers and multi-cavity resonant speakers. Among them, the most used in professional speakers is the inverted speaker, which is characterized by wide frequency response, high efficiency, and large sound pressure, which conforms to the speaker type of professional audio system, but because of its low efficiency, it is less used in professional speakers, mainly used in home speakers, and only a few monitor speakers adopt a closed box structure. The sealed speaker has the advantages of simple debugging of design and production, wide frequency response, and good low-frequency transient characteristics, but the requirements for the dial unit are higher. At present, in a variety of speakers, inverted speakers and sealed speakers account for most of the proportion, and the structure of other types of speakers is numerous, but the proportion is very small.