Unreasonable configuration of speakers and power amplifier.ktv bar sound price

　　Many people think that the output power of the power amplifier is too high, causing damage to the tweeter, but this is not the case. In professional places, the loudspeaker can generally accept a large signal shock of 3 times the rated power, and can instantly accept a peak shock of 5 times the rated power without any problem. Therefore, it is very rare that the tweeter is burned by the high power of the power amplifier, not due to unexpected strong impact or long-term howling of the microphone.

　　As we all know, there are multiple speakers in the speaker box, and the power received by the speakers is distributed differently according to the different frequency division points. The rated power of the speaker, ordinary professional speakers indicate the maximum pink noise power, that is to say, the rated power of the speaker refers to the analog signal power that pink noise or broadband can accept. For a two-way speaker with a crossover point of 1.6kHz and a rated power of 100W, at rated power, the woofer can be assigned an output power of 78W, while the tweeter can only be assigned to 22W. Therefore, it is acceptable to apply 100W of pink noise power or ordinary program signal power to the speaker; when testing with a 100W single-frequency signal, both the tweeter and the woofer may be damaged.

　　If a 3-way speaker, the frequency division point of the mid and treble is at 4kHz, then the power received by the tweeter is only 5% of the nominal power. If the power distribution is improper, it will easily cause damage to the tweeter.

　　Under normal conditions, if the signal input to the speaker is doubled, the power of the tweeter will only increase by 5W; but if the power of the power amplifier is insufficient, the signal overload will be clipped, and the weight of higher harmonics will increase sharply. The original 1kHz sine signal, when the overload clipping is close to the square wave, will generate a large number of odd harmonics outside the 1kHz sine wave, such as 3kHz, 5kHz, etc. sine wave energy, so that the proportion of high-pitched components in the signal It is greatly increased, so that the high frequency spectral energy in the signal far exceeds the power that the tweeter can accept. Even if the total signal power at this time has not reached the rated power of the speaker, the tweeter has been overloaded and damaged. This condition is short-term overloaded than the signal, but does not present an increased risk of clipping. When the signal is not distorted, the power energy of the short-term overloaded 1kHz signal falls on the woofer with higher power, which does not necessarily exceed the short-term maximum power of the speaker. Generally, the power distribution of the speaker will not be biased and the speaker unit will be damaged. Therefore, under normal operating conditions, the rated output power of the power amplifier should be 2-3 times the rated power of the speaker, so as to ensure that the power amplifier does not cause distortion at the maximum power of the speaker.

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