Why would burn tweeters

Author:　News Source:　Click：　Update Time：2007-09-07

In many professional situations, such as studio, theater, meeting rooms, dance halls and so on, often burned speaker, the tweeter phenomenon.
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Inexperienced tuner would think it is too large output power amplifier, resulting in tweeter damage, it is not. In professional situations, the speaker can generally be rated to withstand three times the impact of large-signal power, instantaneous can withstand five times the impact of the peak rated power without damage. Therefore, the speaker to take power amplifier rated at 1 / 2, there will be no problem. Thus, not by accident a long time whistle strong shocks or microphone, amplifier power by burning large tweeter situation is rarely happen. ? A? S7X # W? Z/s7O? (
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As we all know, there are multiple speakers speakers, speakers have the power to bear, according to the different distribution of the different crossover point. Figure 1 is the voice of nature, the energy distribution, under normal circumstances, the speaker of the percentage of power distribution unit as shown. The figure will be a sub-only speakers? | C? Mh? Z? [? W0t? E x
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?? |% \ Super Audio Technology Forum, the frequency band assigned to read from the abscissa, corresponding to the percentage difference between the vertical axis shall be allocated to power. For example, a crossover point of 1.6kHz the two-way speaker (with photos of the A point), Tweeter Power Handling is 100% -78% = 22%, the bass unit to withstand power of 78% -0% = 78% . (P? X% g? C
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u% _ Speaker of the rated power, the general professional speaker marked the largest pink noise power, fever and civilian speakers mark rather vague, but they are the total power of each cell. In other words, speakers of the rated power is able to withstand wide-band pink noise or the analog signal power. A crossover point of 1.6kHz, the 100W rated power of the two-way speakers, at rated power, the bass unit can be assigned to 78W of output power, while the tweeter is only assigned to 22W. Therefore, to impose on the speaker of the pink noise power 100W or general programming signal power, it can withstand; and with 100W single-frequency signal to the test, regardless of treble and bass units are likely to damage. Super Audio Technology Forum-E? P? J? G? D4H;]? D
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If a three-way speaker, medium and treble of the crossover point in the 4kHz, then the tweeter power to bear only a nominal power of 5%. If the power distribution properly, it will easily lead tweeter damage.
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We know that in general the human voice and music are not many components of the signal alt, metal musical instruments, silk string music alt the high side a bit, but speakers of the power distribution ratio of the fundamental law of the triad, as shown in drawings. With three-way speakers, for example, under normal circumstances, if the input signal to the speaker to increase one fold, treble the first power only increased 5W; However, if the amplifier's power shortage, causing signal overload occurs cut increases, high-order harmonic wave component will surge. Originally outside the 1kHz sine wave, producing a large number of odd harmonics, such as 3kHz, 5kHz sine wave energy, etc., so that the signal alt greatly increased the proportion of components, thus causing the signal in the spectrum of energy is far more than treble tweeter can withstand the power. Even if the total power of the signal at this time not yet reached speakers rated power. But the tweeter has been contained and damage. This short-term overload than in the signal, but the rate cut does not appear more dangerous. When the signal is not distorted, short-term overload of the 1kHz signal, power, power energy falls on a large woofer, the speaker is not necessarily over the short-term maximum power, usually does not cause deviation of speaker power distribution unit damaged speakers. Thus, the normal use conditions, the power amplifier rated output power is rated at 2-3 times the speaker in order to ensure maximum power when the speaker does not cause distortion power amplifier. ? N, ^? H? R? H $ o H
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Improper use of dividers
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Improper use of the input crossover point, or the operating frequency range of speakers also contributed to the unreasonable one of the reasons tweeter damage. Using the divider should be strictly in accordance with the supplied speaker operating frequency range to a reasonable choice of crossover point. If you select the crossover point tweeters low power to bear an excessive burden, it is easy to burn tweeter, midrange horn as well.
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EQ adjustments are essential. Frequency equalizer is to compensate for a variety of indoor sound field defects and speakers and set the frequency of non-uniformity, and should use the actual spectrum analyzer or other device for debugging. After commissioning the transmission frequency characteristics should be within a certain range is relatively flat. Many do not have sound knowledge of the tuning member permits it to make debugging, and even a considerable number of people, the high-frequency and low frequency EQ Some of the references too high to form a "V" shape. If the frequency was elevated in comparison with the alto frequency was elevated more than 10dB (EQ adjustment amount will generally be in ± 12dB), then its electrical power than the tenor part of the increased three-fold. This case, not only the phase distortion caused by equalizer to a serious stain on the music, while also causing speaker tweeter easily burned, such situation is the main reason for burning speaker. Certainly, sound system design should be based on actual conditions, such as venue size, uses, building sound conditions into account, according to the actual conditions of use to determine the maximum continuous sound pressure level, in turn, determine the maximum SPL value speaker. , U? W? F? Y r% B & x? R? T% e

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?]: c? j9N: B $ R, rwww.ca001.com a lot of users to post-power amp attenuator placed in the-6dB,-10dB, the volume knob to 70% -80%, or even half of the position, rely on increasing mixer input to achieve the appropriate volume, that the power amplifier left margin, speaker of security, and in fact this is wrong. PA attenuation of the attenuation knob is the input signal that if power amplifier input attenuation-6dB, means to maintain the same volume, mixer or preamp output to be more than 6dB, voltage is higher one times, enter upper headroom, commonly known as "head space", we should have been cut by half. At this time, if sudden large-signal, it will make early 6dB mixer output overload, there cut waveform. Although the amplifier is not overloaded, but the input waveform is cut, treble weight too heavy, not only treble distortion tweeter may also be burned. Super Audio Technology Forum, 6T-I; K
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? Qe:? 9) 4k? V? (Super audio technology forum of the above analysis, allows us a clear understanding of: speaker firing tweeter is an important reason for this is the power amplifier is too small, but not too high. PA send the signal itself is cut pieces of the signal, resulting in damage to speakers. Therefore, configure the audio, we must establish a correct understanding to use the "big horse-drawn cart" option, to prevent the power amplifier and damage to send the signal cut pieces of high-tenor speaker unit. Making the sound system design, the design of power amplifier and a speaker to match according to these principles, the actual operation of equipment is necessary to use the various links is reasonable, in order to achieve both protect your equipment, but also can achieve the best sound system effect.