In many professional occasions, such as studios, theaters, conference rooms, dance halls, etc., the phenomenon of burning the middle and high-pitched units of the speakers often occurs. In audio equipment, the tweeter is crucial. However, it is often burned because of its structural characteristics, which not only causes economic losses but also destroys the performance of the performance, and even leads to failure to perform normally. There are several main reasons:
1, the speaker and power amplifier configuration is not reasonable
It is generally believed that the output power of the power amplifier is too large, causing damage to the tweeter, but it is not. In fact, the speaker can generally withstand three times the rated power of the large signal impact, instantaneously can withstand several times the peak impact of the rated power without damage. Therefore, the case where the power amplifier is large in power and the tweeter is burned is extremely rare. As we all know, there are multiple speakers in a typical speaker, and the power allocated by different speakers at the crossover point is different. The rated power of the speaker, the general professional speaker indicates the maximum pink noise power, that is, the rated power of the speaker refers to the pink signal or the analog signal power that the broadband can withstand. A two-way speaker with a crossover point of 1.6 kHz and a rated power of 100 W, the woofer can be assigned to an output power of 78 W at rated power, while the tweeter is only assigned to 22 W. Therefore, applying 100W of pink noise power or normal program signal power to the speaker can withstand it; when using a 100W single-frequency signal to test, both the treble and the woofer may be damaged. If the power is not properly distributed, it will easily cause damage to the tweeter.
Under normal circumstances, if the signal input to the speaker is doubled, the power of the tweeter is only increased by 5W; but if the power of the power amplifier is insufficient, the signal overload will be cut, and the higher harmonic components will increase sharply. Originally a 1 kHz sinusoidal signal, when the amplitude of the overload is close to a square wave, a large number of odd harmonics, such as 3 kHz, 5 kHz, etc., are generated outside the 1 kHz sine wave, so that the proportion of the high-pitched component in the signal This is greatly increased, which in turn causes the high-audio energy in the signal to exceed the power that the tweeter can withstand. Even if the total power of the signal at this time has not reached the rated power of the speaker, the tweeter has been overloaded and damaged. When the signal is not distorted, the short-time overloaded 1 kHz signal, the power energy falls on the woofer with higher power, does not necessarily exceed the short-term maximum power of the speaker, and generally does not cause the deviation of the power distribution of the speaker and damages the speaker unit. Therefore, when the amplifier is equipped with a power amplifier, the rated output power of the power amplifier should be about 2 times of the rated power of the speaker, so as to ensure that the power amplifier does not cause distortion when the maximum power of the speaker is exceeded.
2, the equalizer debugging is improper
The adjustment of the equalizer is also crucial. The frequency equalizer is set to compensate for various defects in the indoor sound field and the uneven frequency of the speakers. It should be debugged with an actual spectrum analyzer or with other instruments. The transmission frequency characteristics after debugging should be relatively flat within a certain range. Many tuners who do not have audio knowledge are free to debug, and even quite a few people raise the high-frequency and low-frequency parts of the equalizer too high to form a "V" shape. If these frequencies are raised by more than 10 dB compared with the midrange frequency, not only the phase distortion caused by the equalizer will seriously stain the music sound, but also the acoustic tweeter can be easily burnt. This is also the main reason for burning the speaker. . Of course, the design of the sound system should be based on the actual situation, such as the size of the venue, use, sound conditions, etc., based on the actual conditions of use to determine the maximum continuous sound pressure level, and then determine the maximum SPL value of the speaker.
3, the volume is not properly adjusted
Some users set the attenuator of the power amplifier to -6dB, -10dB, which is 70%-80% of the volume knob. Even in the general position, increase the mixer input to achieve the appropriate volume, and think that the power amplifier Leave a margin and the speaker is safe. In fact, this is also wrong. The attenuation knob of the power amplifier attenuates the input signal. If the input of the power amplifier is attenuated by 6dB, it means that to maintain the same volume, the mixer or the front stage must output 6dB more, the voltage is 1 times higher, and the input is The dynamic headroom, commonly known as the "head space", will be cut in half. At this time, if there is a sudden large signal, the mixer output will be overloaded 6dB earlier, and the clipping waveform will appear. Although the amplifier is not overloaded, the input is a clipped waveform, and the high-frequency component is too heavy, not only high-pitched distortion, but also likely to burn the tweeter.
Through the above analysis, we can clearly understand that in the audio system, an important reason for the speaker to burn the tweeter is that the power of the power amplifier is too small. The signal sent by the power amplifier is the clipping signal, which causes damage to the speaker. Therefore, when configuring the sound, it is necessary to establish a correct understanding, rationally perform power matching, and prevent the power amplifier from sending the amplitude-cutting signal to damage the high- and mid-range speaker units. In the design of the sound system, the design power of the power amplifier and the sound should be matched with the above principles. In the actual operation, the equipment of each link should be used reasonably, so as to protect the equipment and achieve the best effect of the sound system.
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