Weak current College】 【professional Equalizer using techniques.

<br> <br> We all know the equalizer's main function is to adjust the colors, adjust the sound field and suppression of acoustic feedback, how to adjust the tone of the article is very much, I want to focus on is how to use .professional multiple schema room equalizer to adjust the sound field and adjust the acoustic feedback. <br> <br> Present professional audio systems use illustration Equalizer are generally around its 31 paragraph sliding potentiometer Q value is constant, typically 1 / 3 octaves, so either .promote or attenuation of a certain frequency, filter bandwidth is always the same, and the frequency and extent of attenuation is 6-18dB in General, the most common is 12dB. Graphic equalizer through Panel sliding key distribution locations, can be very visually reflect the .frequency of lifting and attenuation. Common professional graphic equalizer frequency tuning range generally 20Hz ~ 20kHz, frequency adjustment point General from lowest to highest: 20Hz, 25Hz, 32Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz ., 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz, 1.6kHz, 2kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz, 16kHz, a total of 31 20kHz, frequency ., as they have the main feature is used to adjust the room sound field, and therefore calls for: Professional multiple schema room equalizer. <br> <br> Following my own many years experience of using the equalizer, I would like to write about .for your reference <br> <br> First, use the equalizer to adjust the sound field: <br> <br> In professional Equalizer among the three major features, adjusting the tone should be the most fundamental and most frequently used functions, and .even present a lot of sound division only know the equalizer you can adjust the sound, but don't know what schema room Equalizer more important function is used to adjust the sound field and suppression of acoustic feedback. Use room equalizer to adjust the sound field ., very professional approach is to use the pink noise generator and a real-time Spectrum Analyzer to adjust. But we now most of the audio is not likely to have these devices, you can only make use of, the use of existing equipment to conduct .sound field adjustment, the simplest and most practical way is to use the microphone adjustment, in fact, how to use the phone to adjust the sound field and adjust sound feedback also has some articles about it before, but I think that the introduction of more .or less easy enough, in many years of work, I summed up a set of simple, practical, easy adjustment method, specific adjustment steps are as follows: <br> <br> A, first find a frequency response curve is flat and wide .frequency response range of the microphone, preferably capacitor microphone, or a quality good lap of wired and wireless microphones. Turn the microphone on the microphone stand, in a sound field for the best listening area, height 1.2 meters, microphone pickup head horizontal position and .main speaker of the axis is basically flat, and the main speakers into the isosceles triangle. <br> <br> B, adjustments to be subject to room Equalizer other peripherals bypass through the equalizer all adjustment point zero, mixer, microphone is on channel .Equalizer also to express does not make adjustments, power amplifier on and turn the volume up to a suitable location, and then open the total volume of the mixing console, start slowly to push the microphone volume faders, heard a slight echo sound, then the .microphone volume faders down 6-9 dB. <br> <br> C, and then use the room Equalizer from 50Hz - 16kHz each point step by step upgrade, the following General 50Hz, 16kHz frequency above is no acoustic feedback. Specific adjustment steps .are as follows: <br> <br> 1. find a transfusion in frequency: on sound field effect the greatest transfusion dots General 2 or so, if in a code-named: W's Ballroom, when we both 4kHz 400Hz and for large increase .has a transfusion when, while other frequency point even with significant upgrade (about general upgrade 12dB) did not produce sound transfusion, then we determine in the sound field in transfusion in two points: 400Hz and 4kHz, we want to put these two points about .dB attenuation 6, so you can easily do next. Of course, different sound field back to the frequency of the transmission is not possible. <br> <br> 2. identify the reinfusion of frequency points compared: this point there are three generally ., at this time we turn on the microphone volume mixer on bigger, again on the equalizer, besides other than 400Hz and 4kHz frequency each substantially upgraded, if he's in 200Hz, 1KHz, 5KHz produced a transfusion, the second step of adjustment is also finished .. <br> <br> 3. to identify the frequency of transfusion: adjusted by the above, we have identified five transfusion points, we can put into the most powerful of 400Hz and 4kHz attenuate these two points 6-9 dB or so; .then turn into more powerful 200Hz, 1KHz, 5KHz these three frequency attenuation 3-6 dB, the sound field mostly is adjusted. <br> <br> 2. use the equalizer to adjust sound feedback: <br> <br> Many sound .engineer will have a dilemma: to adjust the sound field and adjust the acoustic feedback is not the same thing? why to distinguish between? actually both, of course, although the adjustment procedures and methods are the same, but its purpose and effect is not .the same. Good sound field just found the lack of sound field and be optimized, but there is no way to solve most of the microphone acoustic feedback, I'm here to say acoustic feedback popular, also known as: transfusion. Or by the .code number is: W's Dance Hall, for example, the dance hall audio system with 6 speakers, and then the ballroom and three stage performances by the actors, scenario if this 6 only microphone wasn't the same brand, and their parameters are different ., to think in this case to completely avoid transfusion will be difficult. But more difficult to find a way to resolveNow, we can use the following methods to reduce and prevent acoustic feedback: <br> <br> First of all, the microphone classification .used in the several microphones, if we chose 2 AKG microphone, 2 x SHURE microphone, and then use the same sound field as adjustment to adjust the sound feedback: <br> <br> 1, for example, we can first take a SHURE .microphone, have it fixed in the microphone stand, respectively in the three stage-wide search for transfusion dots, had a stage area, found a 500Hz major transfusion dots; b the stage area and found a major transfusion 630Hz; in c stage area also .found a 800Hz main transfusion dots.: <br> <br> 2, and then get an AKG microphone, put it on the microphone, and then in three stage-wide search for transfusion dots, had a stage area, found a 1.25KHz .major transfusion dots; b the stage area and found a major transfusion 2.5KHz; in c stage area also found a 3.15KHz main transfusion dots. This is to use two microphones in three stage area in relation to total found: 500Hz, 630Hz, 800Hz ., 1.25kHz, 2.5kHz, 3.15kHz this six transfusion dots, then the Equalizer on the point size according to the transfusion, attenuation 3-9 dB. Of course this three stage area within the same microphone volume situations, it may be a stage .Recycle most found 3 points, and b and c, stage stage even a transfusion dots are not, therefore, and flexible enough to adapt to the circumstances. * <br> <br> 3. using the main microphone in the main show area after .reinfusion one search, and then point to the actors didn't go, but there is a possibility to regional search to see if there are no transfusion dots; and then there's no need to frequently used phone follow the above sequence start searching through transfusion dots .so that the dance hall acoustic feedback would be very good control, of course not possible unrestrained attenuation equalizer, if the equalizer attenuation, riddled with problems, it would sound continuity and fundamental tone that could not be guaranteed. <br> <br> 3 .. use the equalizer to adjust the tone: <br> <br> When the sound field and transfusion dots once adjusted, professional illustration room Equalizer is the most frequently used functions is to adjust the tone, of course, in the adjust tone when to .strike back point is frequency, conditional can increase an equalizer to adjust the tone used exclusively as. In practice various audio devices and different sound field on the equalizer to adjust the course will be different, so it is not possible to have a relatively standard and .a fixed adjustment method, but in my ten years of work, I summed up a set of relative terms applicable to most places of adjustment methods, you can try: <br> <br> A low frequency band adjustments - fine pitch of various audio .sources and fullness, degrees: <br> <br> I'm used to the 20Hz 315Hz frequency range divided into low-frequency band, this adjustment is focused on the various sources of major note pitch, like a pyramid, there is no underlying .part will not have the top part, so the bass frequency adjustment is important. <br> <br> In concrete actions: <br> <br> 1, 20Hz, 32Hz these two frequencies are basically completely attenuation, because now many of the .speakers of the bass frequency not dive to the band. <br> <br> 2, 40Hz, 50Hz these two frequencies is currently China's 220V AC frequency, in order to reduce the power part of our General also put these two frequency attenuation 5 dB .meters. <br> <br> 3, 63Hz, 80Hz, 100Hz three frequency determines the richness, General sources do upgrade and attenuation. <br> <br> 4, 125Hz, 160Hz, 200Hz, 250Hz these four points determine the sources of .strength and strong degree, lifting too much sound attenuation is too stiff, more sound blurred, fat, so that several points in the low frequency band most critical. Tone <br> <br> 95, entire low band need to focus on the point .is to increase the bass part 3 dB, power amplifier load is doubled, so the regulate time must be careful, it is necessary to pay attention to timbre, but also to take account of the sound field, but also takes into account the amplifier's endurance .. <br> <br> B, the adjustment in the band - various sources of good in the second and third overtone and mellow, luminance: <br> <br> I'm used to the 400Hz 2.5KHz range of frequencies in the .frequency band is divided into, we know that most of the sources of main pitch portions in the bass part, then their 2 overtone, 4 3 overtone, overtone ... In the audio section; of course there are also some sources due to the .higher frequency, its main pitch part also in the band. In this section to adjust focus is fine for most audio sources of second and third overtone and timbre of mellow, luminance. <br> <br> In concrete actions: <br> < .br> 1, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, these five frequency impact on the sources and full bodied, this frequency is generally very little promotion, because after the upgrade, such as may affect sound quality - 500Hz 315Hz lift too much ., the sound becomes like out from the bottom; on 630Hz and 800Hz lift too much, the sound becomes like a phone. <br> <br> 2, while 1kHz, 1.25kHz, 1.6kHz, 2kHz, 2.5kHz five frequency impact sound .source luminance, the frequency is human auditory most sensitive, so the impact on the overall tone is also the most, sometimes in a slightly elevated or within-frequency attenuation 1, 2 dB, will change the overall feeling of listening. <br> < .br> The whole band is also the easiest to produce sound feedback frequency range, thus on band frequency adjustment is very flexible, carefully. <br> <br> C, high frequency adjustment - goodVarious sources of numerous overtone and color sense and penetrating: .I am used to the 3.15kHz 20kHz frequency range divided into high-frequency band, this adjustment is focused on the various sources and color sense overtone and penetrating., <br> <br> In concrete actions: <br> <br> 1 ., 3.15kHz, 4kHz, 5kHz, 6.3kHz is the main part of the treble section, these excessive frequency if upgrading, sounds easy to produce Burr interested or producing high-pitched sound feedback, excessive sound attenuation may appear dull, no magnetic, no .vitality. So be careful, careful operation. <br> <br> 2, 8kHz, 10kHz, 12.5kHz influence the three points of the sound level and color. <br> <br> 3, 16kHz, 20kHz because many speakers of high .frequency has not yet reached 20kHz, coupled with the ear seldom heard such a high frequency, so we usually put this point 20kHz for large attenuation and frequency point actually 16kHz this is important, if it has, then treble attenuation in the Golden Rugose feeling is .gone. <br> <br> The high frequency band is in this band have to, because of its frequency is very high, although human auditory does not think it's too obvious, but continued to be on the treble damages caused serious, do not .lightly to be seriously addressed. <br> <br> Where we should be clear about the equalizer is very difficult to have a relatively fixed, fool's adjustment mode, though, I still feel that there are certain rules to be found, here I ' .ll say a my own summary of a common model, you can try the following (in the following frequencies, such as representatives of + + 3 indicates that enhanced the 3 dB;-represents attenuation, such as-12 on behalf of 12 dB of .attenuation; 0 means no lifting or attenuation): <br> <br> A comprehensive performance, most audio system Equalizer adjustments: <br> <br> 20Hz [-12], 25Hz [-12], 32Hz [-10], .40Hz [-8], 50Hz [-4], 63Hz [-2], 80Hz [0], 100Hz [0], 125Hz [0], 160Hz [-2], 200Hz [-3], 250Hz [-3] ., 315Hz [-3], 400Hz [0], 500Hz [0], 630Hz [-2], 800Hz [-1], 1kHz [0], 1.25kHz [0], 1.6kHz [-2], 2kHz [- .3], 2.5kHz [-3], 3.15kHz [-2], 4kHz [-2], 5kHz [-2], 6.3kHz [-3], 8kHz [0], 10kHz [+2], 12.5kHz [ .+3], 16kHz [0], 20kHz [-9]. .<br> <br> B, most disco and slow rocking bar audio system Equalizer adjustments: <br> <br> 20Hz [-12], 25Hz [-12], 32Hz [-8], 40Hz [-5], 50Hz .[-2], 63Hz [0], 80Hz [0], 100Hz [0], 125Hz [+2], 160Hz [+2], 200Hz [+3], 250Hz [+1], 315Hz [-1], .400Hz [0], 500Hz [0], 630Hz [-2], 800Hz [-1], 1kHz [0], 1.25kHz [0], 1.6kHz [-2], 2kHz [-4], 2.5kHz [- .2], 3.15kHz [+2], 4kHz [-2], 5kHz [-2], 6.3kHz [-3], 8kHz [-2], 10kHz [0], 12.5kHz [0], 16kHz [-3 .], 20kHz [-9]. .<br> <br> Professional Equalizer problems when used <br> <br> 1, usually acoustic feedback on 100Hz - 10kHz, adjustments should be targeted. <br> <br> 2 adjust the sound field, you are subject to room Equalizer .other peripherals bypass through the microphone is located on the mixer channel Equalizer also do not want to pass through; adjustment. <br> <br> 3. use the equalizer to adjust the acoustic feedback, simply press the device through, other peripheral devices such .as actuators, etc, to adjust to the best show status, the channel mixer with microphone on the equalizer to adjust to the best show state this is and adjust the sound field of distinct. <br> <br> 4, either use the equalizer .to adjust the sound or adjust the acoustic feedback, if your system has the compressor unit, to express it, otherwise the microphone in the first transfusion, are affected by the Compressor Limiter; wait for transfusion signal, compression is suppressed, the transfusion will break .through the limitations of the compression is suddenly very much, so easily damaged equipment. <br> <br> 5, through my many years of practice, adjusting sound field and adjust the acoustic feedback, you can adjust the background music while playing a little ., so you can make sound field active, more convenient to adjust. <br> <br> That so many do not know you are there to help, and finally I want to say is, in the site during the performance, if you do .not have to adjust the sound field, then the overall tone, balance, it can not be guaranteed if the acoustic feedback is not adjusted well, there was even a transfusion, it is also a very serious problem, my principle is: the entire show .as long as there is a time of acoustic feedback is failed!, so I often described as we push the mixer faders when performance is like pushing a time bomb, don't know when it would explode (transfusion), so when you really need .on site very carefully, to have the feeling of walking on thin ice! so scene audio normal pressure is great, if the recording was not ready when we can be registered or edited, but in the onsite show if you have even the sounds of feedback ., like splashing out of the water, is no way to recover, so a lot of high levels of recording are not wanted to do fieldAudio Division. <br> <br> Previously said sound engineer is a work of art and technology, I think .adding a: challenging! I hope that each of us the courage to face all the sound engineer, dare to challenge ourselves to improve our level of tuning! <br> <br> <br> <br> <br>.