Basic knowledge of professional audio

   I. Speakers Speakers are composed of speakers, cabinets, crossovers, etc. 1. Classification of home speakers and professional speakers. The main differences between the two are as shown in the figure below. Classification of tone (sound quality) appearance structure sensitivity speaker power; home speaker sound quality Slim, clear layers, strong resolution, exquisite and beautiful, generally low. Generally <100W professional speaker sound quality is hard, good strength, strong directivity, not very delicate, easy to assemble, hoist, strong structure, 95-110dB / mw even more High 100W to several thousand W. 2. According to the range of the audio band, there are full-band speakers. Subwoofers and subwoofers. Full-band speakers refer to speakers that can cover bass, midrange and treble. It is generally used to supplement the full-range bass and subwoofer to enhance the strength and shock of the playback. 3. According to the purpose, professional speakers can also be divided into main sound boxes, monitor speakers, and return speakers. The sound reinforcement box is generally used as the main speaker of the sound system to the public. It is responsible for the main sound reinforcement task of the sound system, so it should use full frequency Speakers, speaker full frequency band can also use combined PA plus subwoofer. The full range audio MADCSX-57. 56 and the like.

Monitor speakers are used in control rooms, recording studios and other places for the tuner to monitor the program, generally require better upper and lower limit frequency and higher fidelity. The return listening speakers are also called stage monitor speakers, generally used At the stage or dance hall, etc., for actors or band members to monitor their singing. The sound of performance. For example, csx38m can be divided into sealed speakers according to the structure of the cabinet. Inverted speakers. Labyrinth speakers. (1) sealed speakers It has the advantages of simple structure, small size, good low-frequency transients, but low efficiency. Sealed speakers are mainly used in home speakers, which are rare in professional speakers, and only a few monitor speakers use a sealed structure. 2) Inverted speaker Inverted speaker can be suitable for various types of speakers, with rich bass, which makes people feel stretched.It is used in home speakers and professional speakers, especially in professional speakers, it is used Because it has the characteristics of wide frequency response, high efficiency, high sound pressure and so on. Due to the above reasons, inverted speakers are widely used in dance halls, theaters, theaters, professional shoulder listening speakers, such as MAD Series speaker products are Inverted type. Of course, the inverted type speaker also has its shortcomings. It radiates the sound pressure level in the low frequency band below the resonance frequency of the speaker box and decays quickly. 1 Frequency division network Frequency division network is also called frequency divider. Common frequency division methods can be divided into two types. One is the power frequency divider. The frequency divider is set between the power amplifier and the speaker. It divides the output power of the power amplifier and assigns it to each speaker according to different frequency bands. Another type of frequency divider is an active frequency divider, also known as an electronic frequency divider. The frequency divider is set between the front-stage voltage amplifier and the power amplifier. Because of its small current, it can be implemented with a small power electronic active filter. (This type of frequency divider is commonly used in power amplifiers or used alone)