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How To Choose The Broadcast Fixed Pressure Power Amplifier?
Jul 10, 2018

Public broadcast amplifier is different from HI-FI amplifier. The most important feature is the output terminal with 70V and 100V constant pressure. This is because broadcast lines are usually quite long and high voltage transmission is required to reduce the loss of the lines.

The most important index of broadcast amplifier is rated output power. The amount of rated output power should be chosen, depending on the total power of the broadcast loudspeaker. For broadcasting system, as long as the total power of the speaker is less than or equal to the rated power of the power amplifier, and the same voltage parameters, can be optional adaptor, but considering the line loss, aging etc, should be appropriate power margin. According to the requirements of the "specification", the capacity (equivalent to rated output power) of power amplifier equipment should be generally calculated as follows:

P = K1, K2, Σ P0 (2)

Total output power of p-power amplifier (W)

P0- maximum power for each branch (equivalent to a partition) broadcast simultaneously

P0 = Ki · Pi

Rated capacity of the pi-i division loudspeaker

Co-demand coefficient of ki-i partition:

Service broadcast guest room program, 0.2 ~ 0.4

Background music system, 0.5 ~ 0.6

Commercial broadcasting, 0.7 ~ 0.8

Fire incident broadcast, take 1.0

K1-line loss compensation coefficient: 1.26 ~ 1.58

K2- aging coefficient: 1.2 ~ 1.4

Therefore, if it is background music system, the rated output power of broadcast amplifier should be about 1.3 times of the total power of broadcast loudspeaker.

However, all public broadcasting systems should, in principle, be able to carry out disaster emergency broadcasting. Therefore, the system must set up the emergency broadcast amplifier. According to the "specification", the rated output power of the emergency broadcast amplifier should be 1.5 times of the total capacity of the broadcast loudspeaker.

This is only the selection of broadcast power amplifier. In specific use, attention should be paid to avoid short circuit, heat dissipation, dust removal and other protective measures to ensure the normal and stable operation of the system.

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