Secondly, the power allocation of the public address amplifier and the speaker is also related to the target loudness and the occasion used. Under a certain target loudness, the dynamic of the music signal should be fully guaranteed on every device. If the power amplifier is too large, its gain setting is very small, and the loudness has reached the requirement, but the dynamic range of the signal is limited by the amplifier's gain. Therefore, the power of power amplifier should not be too large; otherwise, it will not only waste expenditure but also bring the trouble of not taking account of loudness and music dynamics, as well as excessive loudspeaker load. According to past experience, there are differences in general language, music amplification venues, and large dynamic disco venues. In general, the signal fluctuation of the amplifier is small, and it does not need the power amplifier to supply a large current to the speaker for a long time or very quickly, so the power of the power amplifier should be smaller than that of the large dynamic amplifier which requires strong and powerful power. In addition, the so-called "margin of power" should also be targeted at speakers. It is worth noting that the selection of power amplifiers must be decided by speakers, and there should not be the concept of "margin of power" to configure power amplifiers.
In other words, at a certain target loudness, the speaker can be larger than the design value for different purposes, and the power of the amplifier should be strictly determined by the speaker, without too much flexibility. In short, the specific standard of power allocation between amplifier and speaker should be: under certain impedance conditions, the power of the amplifier should be greater than that of the speaker, but not too large. The undistorted rate of the power amplifier in general application place should be about 1.2-1.5 times of the rated power of speaker, while in the large dynamic situation it should be about 1.5-2 times. Referring to this standard, not only can the amplifier work in a * state but also can ensure the safety of the speaker. Even for inexperienced operators, as long as it is not serious misoperation or inappropriate adjustment of peripheral equipment of the front stage, the speaker and the amplifier can work in a stable state.