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The use environment of the loudspeaker installation of the broadcasting system
August 23, 2022
1. According to the installation and use environment of the horn to distinguish
A. Outdoor type B. Indoor type
C. Mixed indoor and outdoor
D. Relatively concentrated
E. Dispersed
2. According to environmental conditions
A. Quiet environment (below 30db)
B. General noise environment (30-60db)
C. High noise environment (above 60db)
3. Environmental requirements for speaker power and form
Outdoor quiet environment, generally controlled between 3-5W per 10 square meters, should use low-power sound column and general speakers
The general outdoor noise environment is generally controlled between 5-15W per 10 square meters, and medium-power sound columns, lawn speakers, and directional speakers should be used.
Outdoor high noise environment, generally controlled between 10-25W per 10 square meters, should use high-power sound column, directional horn-type speakers.
Indoor high noise environments, such as waiting halls, exhibition halls and other places, can refer to the outdoor general noise environment to consider the power. Indoor quiet environments, such as libraries, hotels, classrooms, conference rooms, etc., can be calculated by 80% based on the outdoor quiet environment standard. The speakers generally use ceiling speakers and wall-mounted speakers.
4. How to determine the total power of the power amplifier
Calculation of the total power of the power amplifier, if it is used in background music, 30% of the loss can be added to the total power of the speaker as the total power of the power amplifier; if a fire alarm is required, 50% of the total power of the speaker can be added. The total power of the amplifier.
5. The measurement method and operation essentials of whether the match between the release machine and the load is appropriate
When the external load is less than the rated load of the power amplifier, when the output U is greater than the rated value and I is less than the rated value, the power of the power amplifier should not be adjusted too large, so as not to cause speaker distortion;
When the external load is greater than the rated load of the power amplifier, the output U is less than the rated value and I is greater than the rated value. This situation should be avoided as much as possible, because the excessive current for a long time will cause the circuit and the power amplifier to heat up and eventually burn Bad amplifiers, line-to-line transformers, and speakers;
When the external load is equal to the rated load of the power amplifier, the output U and I are equal to the rated value. This is an ideal matching method, but it needs to be carefully designed.
6. An important matching device for public broadcasting equipment—line-to-line transformers
It is enough to pay attention to the positive and negative stages and do not reverse the input and output of the line-to-line transformer in the use and connection.
7. The operation method and precautions of the power amplifier in the use and adjustment
The installation of the volume control potentiometer should pay attention to the positive and negative levels being reversed, adjust the volume, the coordination of high and low, and the signal distortion and the speaker power can be matched.
Do not allow the positive and negative levels of the line to be reversed, and adjust the volume and power level not excessively, generally not exceeding 2/3 of the total volume, and do not allow the power amplifier to work at full load and power overload for a long time.
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