At present, the level of program signal source equipment and power amplifiers have been made very high, so a sound system composed of high-quality audio sources, high-quality amplifiers and speaker systems, the key is the speaker. He is an extremely important link in the entire sound system. Because the sound quality of the speakers has a great impact on the entire sound system.

speakers have different uses in different occasions, and also have different uses in different situations. Common classifications in professional audio are as follows:

1 According to the audio frequency, it can be divided into three kinds of full-band speakers, subwoofer speakers and subwoofer speakers. The so-called full-band speaker refers to the sound that can cover the low frequency, intermediate frequency and high frequency range. The lower limit frequency of the full-band speaker is generally 30Hz-60Hz, and the upper limit frequency is 15KHz-20KHz. In the usual small and medium-sized sound system, only one pair or two groups of full-range speakers can be used to fully take on the playback task. Bass speakers and subwoofers are generally dedicated speakers used to supplement the low-frequency and ultra-low frequency playback of full-band speakers. As for this type of speaker, it is generally used in large and medium-sized audio systems to enhance the strength and shock of low-frequency playback. When in use, most of the frequency is divided by an electronic crossover (crossover), the low frequency signal is sent to a special bass amplifier, and then the bass or subwoofer speaker is promoted.

2. According to the occasion of use: divided into two types, professional speakers and home speakers. Household speakers are generally used for home playback. They are characterized by fine and fine playback sound quality, more refined and beautiful appearance, not too high playback sound pressure level, and relatively little power. Professional speakers are generally used in professional entertainment venues such as dance halls, karaoke halls, theaters, halls and stadiums. Generally, professional speakers have high sensitivity, high playback sound pressure, good power, and high power. Compared with home speakers, their sound quality is harder and their appearance is not very delicate. However, the performance of monitor speakers in professional speakers is similar to that of home speakers, and their appearance is generally more exquisite and compact, so this type of monitor speakers are often used in home Hi-Fi audio systems.

3. Divided by purpose: generally can be divided into the main speaker. Monitor speakers and return speakers, etc. The main sound box is generally used as the main sound box of the sound system to undertake the main sound reproduction task. The performance of the main playback speaker has a great impact on the playback quality of the entire audio system, and a full-band speaker plus a subwoofer speaker can also be used for combined playback.

monitor speakers are used for program monitoring in control rooms and recording studios. They have the characteristics of small distortion, wide and flat frequency response, and little modification of the signal, so they can most truly reproduce the original appearance of the program. Back-to-listening speakers, also known as stage monitor speakers, are generally used on stages or dance halls for actors or band members to monitor their singing or performance. This is because they are located behind the main sound box on the stage, and cannot hear their own voice or the band's performance clearly, so they can't cooperate well or can't find out the feeling, which seriously affects the performance. Generally, the return-to-listening speaker is made of a bevel shape and placed on the ground, so that it can be placed on the stage without affecting the overall shape of the stage, and it can be heard clearly by the people on the stage during playback, and the sound will not be fed back to the microphone. Howling.

is divided according to the cabinet structure: it can be divided into sealed speakers, inverted speakers, labyrinth speakers, sonic tube speakers and multi-cavity resonant speakers. Among these types, the most commonly used inverted speaker is the inverted speaker, because its specific characteristics are wide frequency response, high efficiency, and large sound pressure, which are in line with the type of professional audio system speakers. The sealed speaker has simple design, debugging, and frequency. It has the advantages of wider sound and good low-frequency transient characteristics, but it has higher requirements for the dial unit.