Broadcast amplifiers are different from HI-FI amplifiers. Its main characteristic is having 70V and 100V constant voltage output terminals. This is due to the fact that broadcast lines are usually quite long and high-voltage transmission is required to reduce line losses.
The most important indicator of a broadcast power amplifier is the rated output power. The rated output power should be chosen depending on the total power of the broadcast speaker. For broadcast systems, as long as the total power of the broadcast speakers is less than or equal to the power rating of the amplifier, and the voltage parameters are the same, they can be randomly connected. However, considering the factors such as line loss and aging, the power margin should be properly reserved. In accordance with the requirements of the 'specification', the capacity of the power amplifier equipment (equivalent to the rated output power) should generally be calculated as follows:
P=K1·K2·ΣP0(2)
P-power amplifier output total power (W)
P0—Maximum electric power P0=Ki·Pi at the same time when each splitter (equivalent to the partition) broadcasts simultaneously
Pi—the i-th partition speaker nominal capacity Ki—the i-th partition needs the coefficient:
Service broadcast room program, take 0.2~0.4
Background music system, take 0.5~0.6
Business broadcast, take 0.7~0.8
Fire accident broadcast, take 1.0
K1—Line attenuation compensation coefficient: 1.26~1.58
K2—aging coefficient: 1.2~1.4
Therefore, if it is a background music system, the rated output power of the broadcasting amplifier should be about 1.3 times the total power of the broadcasting speaker.
However, all public broadcasting systems should, in principle, be able to broadcast emergency disasters. Therefore, the system must be equipped with an emergency broadcast amplifier. According to the 'specification' requirements, the rated output power of the emergency broadcast power amplifier should be 1.5 times the sum of the speaker capacities in the three partitions with the largest capacity of the broadcast speaker to other specifications of the broadcast power amplifier, depending on the specific structure and investment of the broadcasting system.
The most important indicator of a broadcast power amplifier is the rated output power. The rated output power should be chosen depending on the total power of the broadcast speaker. For broadcast systems, as long as the total power of the broadcast speakers is less than or equal to the power rating of the amplifier, and the voltage parameters are the same, they can be randomly connected. However, considering the factors such as line loss and aging, the power margin should be properly reserved. In accordance with the requirements of the 'specification', the capacity of the power amplifier equipment (equivalent to the rated output power) should generally be calculated as follows:
P=K1·K2·ΣP0(2)
P-power amplifier output total power (W)
P0—Maximum electric power P0=Ki·Pi at the same time when each splitter (equivalent to the partition) broadcasts simultaneously
Pi—the i-th partition speaker nominal capacity Ki—the i-th partition needs the coefficient:
Service broadcast room program, take 0.2~0.4
Background music system, take 0.5~0.6
Business broadcast, take 0.7~0.8
Fire accident broadcast, take 1.0
K1—Line attenuation compensation coefficient: 1.26~1.58
K2—aging coefficient: 1.2~1.4
Therefore, if it is a background music system, the rated output power of the broadcasting amplifier should be about 1.3 times the total power of the broadcasting speaker.
However, all public broadcasting systems should, in principle, be able to broadcast emergency disasters. Therefore, the system must be equipped with an emergency broadcast amplifier. According to the 'specification' requirements, the rated output power of the emergency broadcast power amplifier should be 1.5 times the sum of the speaker capacities in the three partitions with the largest capacity of the broadcast speaker to other specifications of the broadcast power amplifier, depending on the specific structure and investment of the broadcasting system.
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