A broadcasting amplifier is a power amplifier specifically designed for broadcasting systems, with the characteristics of constant voltage output, long-distance transmission, and adaptability to various loads.

Broadcast amplifiers typically use a constant voltage output method, where the output voltage does not vary with changes in load impedance, allowing them to maintain stable signal voltage during long-distance transmission and reduce power loss on transmission lines. The output voltage of a constant voltage amplifier mainly includes 70V, 100V, etc. The higher the voltage, the smaller the transmission line loss, but the sound quality may be affected to some extent. Therefore, it is generally used in background music systems and cable broadcasting systems.

In a broadcasting system, a broadcasting amplifier needs to be connected to multiple speakers, so it must be able to adapt to different loads. The constant voltage amplifier is connected to the speaker through a matching transformer to reduce voltage, ensuring stable power transmission. In addition, broadcast amplifiers also have multiple input line forms and sound source composition forms to meet the needs of different broadcast systems.

Overall, broadcast amplifiers are essential equipment in broadcasting systems, and their performance and quality directly affect the effectiveness and stability of the broadcasting system. Therefore, when selecting and using a broadcast amplifier, it is necessary to fully consider factors such as its output mode, load adaptability, input line form, and sound source composition form.