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The method of wiring the fixed resistance amplifier and the fixed pressure amplifier

Author:admin   AddTime:2021-03-24

With the development of society, the application range of broadcast sound amplification system is more and more extensive, and the sound amplification system is divided into fixed pressure amplification system (public broadcasting system) and fixed-block broadcasting system (professional audio, conference sound amplification system). The fixed-block broadcasting system is generally a place with high sound quality requirements, such as conference system, stage sound system, KTV sound system. Fixed pressure work can be seen everywhere in life, such as campus radio, community broadcasting, rural radio and so on. How should the broadcast sound amplification system be wired? 
       Fixed voltage amplifier, also known as broadcast amplifier, is a high voltage output of broadcast equipment (domestic 120V, 240V for many), its wiring mode for all the horn interline transformer primary end and amplifier output of 120V connection can (i.e. all in-line), the total power of the horn should not exceed the amplifier rated power. It should be noted that if the horn is relatively close to the words to maintain the horn phase consistent, that is: the positive is all positive, the negative is all negative.
       The connection of the fixed-voltage sound system is very simple: as long as the input voltage of the speaker matches the output voltage of the amplifier, the total power of the speaker does not exceed the total power of the amplifier, the speaker can be connected directly to the output of the amplifier one by one; Must be received 100V terminals, the terminal of the speaker has no pictures, so only according to experience introduced: the general fixed-voltage speakers are mostly 70V and 100V two voltages, take the two terminals on the edge, is 100V, It is estimated that the red line is the terminal of 100V, and the rest is the one on the other side. If you really don't understand, you can use a meter measurement, the two resistors are 100V.

Partition CH1-CH4 is the partition output, the machine panel should have a corresponding switch, the use of this function can be broadcast to the school grades, of course, can also be broadcast to the shopping mall floors separately. As a fixed-pressure broadcast, to buy fixed-pressure speakers to match it, because the market commonly used ceiling, wall-mounted speakers to 120V (100V) for more, so the output of the broadcast line to connect 0V, 100V can be.
      Each rated impedance output power amplifier specifies the rated load impedance and the rated output power at this rated load impedance. Most fixed-impedance output power amplifiers have a rated impedance of 8 s and can also be connected to a 4 s load impedance and a 16 s load impedance. Some power amplifiers can even be connected to a load impedance of 2 s. However, it is important to read the instructions to understand how much load impedance the power amplifier is receiving, and how much power the power amplifier is rated for. Since most fixed-impedance output power amplifiers have a rated load impedance of 8 s, most speaker systems also have an impedance of 8 s. The technical instructions of many fixed-impedance output power amplifiers indicate not only how much W the load impedance is when the load impedance is 8 s, but also how much W the rated output power is when the load impedance is 4 s. At this point, pay attention to the impedance and power of the speaker system you are using, and with the power amplifier at the rated load impedance of the rated output power control, generally do not advocate the use of two speakers in series or in tandes with the power amplifier. When available, the speaker system is not connected in series and in-line to match the load impedance of the power amplifier. However, it is important to pay attention to the impedance of each speaker system and the rated power of the speaker system. In series, loudspeakers with large impedances will be as much power as possible, and in the case of concatenants, speakers with low impedance will be as much power as possible. It is strictly calculated so that each speaker does not exceed its rated power.

       The amplifier of the fixed-resistance broadcasting system is a fixed-stop amplifier, and the combined fixed-stop amplifier output interface is usually two channels, each channel connecting a speaker that matches the amplifier power, usually 1.3 times the power of the speaker. The four-channel amplifier has one speaker for each channel and can be connected to four speakers. The pure post-stage fixed-resistance amplifier is the same as the merge amplifier, with one speaker connected to each channel. The input interface of the fixed-block merge amplifier, there is MIC interface, DVD input interface, LINE input interface, CD and computer input interface. These interfaces can connect responding devices. 


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