1, speaker and power amplifier configuration is not reasonable

The output power of the power amplifier is too large to cause the damage of the treble unit. In professional occasions, the speaker can generally withstand 3 times the rated power of the large signal impact, can withstand an average of 5 times the peak power rating and no problem. Therefore, it is not because of the strong impact of the accident or the microphone for a long time, while the power amplifier power and the firing of the treble unit is rare.

As we all know, there are a number of speakers speaker, the speaker to withstand the power, according to the different frequency points for different distribution.

The rated power of the speaker, the general professional speakers to indicate the maximum pink noise power, that is, the speaker's rated power refers to pink noise or broadband can withstand the analog signal power. A frequency division of 1.6kHz, rated power of two 100W frequency divider, in the rated power, the bass unit can be assigned to the output power of 78W, while the treble unit is assigned to 22W. Therefore, it is possible to apply the pink noise power of the 100W or the power of the ordinary program signal to the speaker, while the single frequency signal of the 100W is used to test whether the treble and the bass unit can be damaged. If a three frequency speaker, the middle and treble frequency points in the 4kHz, then, the treble unit withstand power only nominal power of 5%. If the power allocation is not appropriate, it will easily cause damage to the treble unit.

Under normal circumstances, if the input signal to the speaker to increase 1 times, treble head power increased by only 5W; but if the power of the power amplifier is not enough, resulting in the signal overload appears clipping, harmonic components will surge. Originally 1kHz sinusoidal signal, square wave clipping close in overload, will be in the 1kHz sine wave, odd harmonics generated a large number of sine wave energy such as 3kHz, 5kHz, treble components in the signal ratio increased dramatically, resulting in high spectral energy signal in far more than treble power unit can bear. Even if the total power of the signal has not yet reached the rated power of the speaker, but the treble unit has been overloaded and cause damage. This condition is more dangerous than signal short-time overload, but not clipping. In the signal without distortion, 1kHz signal short-time overload, power energy falls in the bass unit larger power, maximum power not more than short-term speakers, generally will not cause the deviation of power allocation and damage the speaker speaker unit. Thus, under normal use conditions, the rated output power amplifier should be rated 2 to 3 times the speaker power, in order to ensure that the maximum power amplifier in the speaker does not cause distortion.

2, frequency divider improper use

Improper use of the frequency of the input points, or the speaker is not reasonable to work frequency range is also a cause of treble unit damage. In the use of frequency divider, manufacturers should be strictly in accordance with the frequency range of the speaker to choose a reasonable frequency division. The tweeter crossover point if the choice is low, bear power burden, it is easy to burn the tweeter, so is the midrange horn.

3, improper equalizer debugging

Adjustment of the equalizer is also crucial. The frequency equalizer is designed to compensate for the various defects of the indoor sound field and the different frequency of the loudspeaker. The frequency characteristics of the transmission after commissioning should be relatively flat within a certain range. Many do not have a sound knowledge of the mixer to debug, and even a considerable number of people, the equalizer of high frequency and low frequency part raised too high, forming a "V" shape. If the frequency and frequency is higher than 10dB compared to enhance the tenor (adjust the amount of equalizer in 12dB generally) words, not only caused the serious phase distortion equalizer to the sound of music at the same time, was also extremely easy to cause the sound tweeter burned, this kind of situation is the main reason for damage of the loudspeaker. Of course, the design of sound system according to the actual situation, considering the size of the site, such as purpose, build sound conditions, to determine the maximum continuous sound pressure level according to the actual conditions of use, and then determine the maximum value of the SPL speaker.

4, the volume adjustment

Many users to post amp the attenuator in -6dB, -10dB, 80% - 70% volume knob, even the general position, by enlarging the mixer input to the appropriate volume, that the power amplifier of a room, the speaker is safe, actually this is wrong. The power amplifier is the input signal attenuation attenuation knob, if the power amplifier input attenuation of 6dB, which means to maintain the same volume, mixer or front level must be multi output 6dB voltage, 1 times higher, the dynamic margin input, commonly known as "head space" will be cut in half. At this time, if there is a sudden large signal, it will be as early as 6dB so that the output of the mixer overload, the clipping waveform. Although the amplifier is not overloaded, but the input is clipping waveform, treble weight is too heavy, not only treble distortion, treble unit is also likely to burn out.

summary

One of the important reasons for the burning of the tweeter is that the power of the power amplifier is too small, not too large. The signal from the power amplifier is the clipping signal, which causes damage to the speaker. Therefore, in the configuration of the sound, it is necessary to establish a correct understanding of the use of the "big horse pull car" program to prevent the power amplifier to send out the clipping signal to damage the high, alto speaker unit. In the design of sound system, matching design of power amplifier and sound principles above cases, the actual operation of all aspects of the equipment to use reasonable, then we can protect the equipment, but also can make the sound system to achieve the best effect.