1. The configuration of speakers and power amplifiers is unreasonable
Unless experienced tunnels will believe that the output power of the power amplifier is too great, causing damage to the treble unit, but it is not. In professional occasions, speakers can generally bear 3 times the signal impact of the rated power 3 times, and it can withstand 5 times the peak impact of the rated power without problems. Therefore, it is not due to the strong impact of the accident or the microphone, but the situation of the power amplifier’s power is large and the burning treble unit rarely appears.
As we all know, there are multiple speakers in the speakers, and the power of the speaker is differently allocated according to the different frequency points. The rated power of the speaker, generally professional speakers indicate the maximum pink noise power, that is, the rated power of the speaker refers to the simulation signal power that pink noise or broadband belt can withstand. A two -point frequency speaker with 1.6kHz and a rated power of 100W is a score point. When the rated power is rated, the bass unit can be distributed to the output power of 78W, and the treble unit is only allocated to 22W. Therefore, it can bear the pink noise power or ordinary program signal power for the speaker, and it can bear it; and when testing with a single -frequency signal of 100W, it may be damaged regardless of the treble and the bass unit.
If a three -point frequency speaker, the medium and high frequency frequency frequency points are 4KHz, then the endless power of the treble unit is only 5%of the nominal power. If the power distribution is improper, it will easily cause damage to the treble unit.
Under normal circumstances, if the signal to the speaker is doubled, the power of the high tone is only 5W; however, if the power amplifier is insufficient, the signal overloading occurs, and the high harmonic component will increase. The sine signal of 1kHz was originally 1kHz. When the overload cutting is close to the square wave, it will generate a large number of strange harmonic waves outside the 1kHz sine wave, such as 3kHz, 5KHz, etc. Greatly increased, which caused the energy of the treble spectrum in the signal far more than the power that the treble unit could withstand. Even though the total signal power at this time has not reached the rated power of the speaker, the treble unit has been overloaded and damaged. This situation is overloaded shorter than the signal, but it is even more dangerous without cutting. When the signal is not distorted, the short -term overloaded 1kHz signal, the power energy falls on a large bass unit, does not necessarily exceed the short -term maximum power of the speaker. Generally, it will not cause the deviation of the speaker power distribution and damage the speaker unit. Therefore, under normal use conditions, the rated output power of the power amplifier should be 2-3 times the rated power of the speaker, so that the power amplifier does not cause distortion when the maximum power of the speaker can be ensured.
2. Improper use of frequency divisor
Improper use of the input terminal frequency point, or the unreasonable operating frequency range of the speaker is also a cause of damage to the treble unit. When using a frequency division, the frequency frequency point should be reasonably selected according to the operating frequency range provided by the manufacturer. If the frequency point of the treble speakers is low and the power burden is too heavy, it is easy to burn the treble unit, as well as the medium tube.
3. Improper debugging in equalizers
The adjustment of the balancer is also crucial. The frequency balancer is set to compensate the various defects of the indoor sound field and the uneven frequency of the speakers. The actual spectrum analyzer should be debugged with the actual spectrum analyzer or other instruments. The debugging frequency characteristics should be relatively flat within a certain range. Many tunnels who do not have audio knowledge have debugged at will, and even quite a lot of people have raised the high -frequency and low -frequency parts of the balancer to form a “V” shape. If these frequencies are higher than 10DB compared with the medium audio (the adjustment amount of the equilibrium is generally 12DB), not only the phase distortion caused by the balancer should be severely stained with the sound of music, and it is also easy to cause the audio treble unit unit Burning, this kind of situation is also the main reason for burning the speaker. Of course, the design of the audio system should be based on the actual situation, such as venue size, use, and sound building conditions. The maximum continuous acoustic level should be determined according to the actual conditions, and the maximum SPL value of the speaker must be determined.
Fourth, regulation of volume
Many users set the attenuators of the rear amplifier at -6DB, -10DB, that is, 70%-80%of the volume knob, or even general positions, rely on increasing the input of the tuning table to achieve the appropriate volume. There is a balance in the amplifier, and the speakers are safe. In fact, this is also wrong. The attenuation of the power amplifier is attenuated in the input signal. If the input attenuation of the power amplifier is attenuated 6DB, it means that to maintain the same volume, the mixer or the front stage must output 6DB, the voltage is 1 times, the input is input, the input is input, and the input is input. The dynamic balance, commonly known as “top of the head”, is cut off by half. At this time, if there is a large signal, it will output overloads of the mixer 6DB early, and the cutting waveform will appear. Although the amplifier is not overloaded, the scattered waveform is entered, and the high sound weight is too heavy.
The above analysis can make us clearly understand that an important reason for the speaker and treble unit is that the power of the power amplifier is too small, not too large. The signal of the power amplifier is the script signal, which causes damage to the speaker. Therefore, when configured the sound, we must establish the correct understanding. The “Malaysia car” solution should be used to prevent the power amplifier from sending the cutting signal to damage high and the middle sound speakers unit. When designing the audio system, the power amplifier and the design power of the audio must be matched the above principles. The equipment in each link in the actual operation must be reasonable to protect the equipment and the best effect.
Reasons for burning speakers in professional occasions