【 Weak current College 】 stage machinery safety design (1)

First, an overview
Stage machinery one of the most important indicator is the safe, reliable, and all kinds of stage machinery must be guaranteed at all times is absolutely secure.
On the stage machinery reliability design, very few of the present study. Reliability design theory is built on a large number of experimental data, on the basis of different applications require different reliability, equipment reliability is based on its important, work requirements and ease of maintenance, and other factors into consideration. The stage machinery of the usage is not high, load rate is low, the life design a set of requirements and design for reliability is very high, because in the event of a problem may result in serious accidents or large economic losses. Stage machinery must have a high reliability, failure probability should be 0.1 ~ 1.0%. Due to the lack of the necessary experimental data and specific in-depth research, reliability and design theory at the stage of mechanical design, there is no specific application. Research shows that although only safety factor does not completely reflect the reliability level, but on the stage in the design of the mechanical components of the arguments as random variables, there is a lack of adequate data. Therefore, the design parameters used for determining the amount of stress intensity factor of perhaps as a differentiator, by selecting the appropriate safety factors to approximate control its reliability, remains the current stage machinery design-led approach. As a result of calculation results and the actual situation has some deviations, it must be made to compute the allowed parts of bearing capacity necessary for the safety margin, this is the starting point for determining the basic safety factor. Typically, the stage machinery should also propose design life indicators. The length of life of indicators on the stage machinery does not apply to work hours in the life of the more realistic, 8000 ~ 10000 hours of working life should be the basis for the stage machinery design.
The stage machinery of security indicators including device security, physical security and electrical safety aspects, and that these three factors associated with each other, mutual influence, sometimes are inseparable.

【 Weak current College 】 professional audio terminology in English (4)

Ddouble dual, dual of
Ddrum drums, drum
DAdelayedaction delay effect
D/Adigital/analog-digital/analog
DABdigitalaudiobroadcasting digital audio broadcasting
Damp damping
DASHdigitalaudiostationarhead digital fixed head
Dashpot bumpers, shock absorber
DATdigitalaudiotape digital audio tape recorder, digital
DATA data
DATAtron data processor
DATE date
DB decibel (dB) DB
DBdistribution junction
DBAdecibelasolute absolute DB
DBAdecibeladjusted adjusted decibel
DBBdynamicbassboost dynamic bass boost
DBKdecibelsreferredtoonekilowatt kW DB
DBmdecibelaboveonemilliwattin600ohms milliwatt
DBSdirectbroadcastsatellite DBS
DBX noise reduction system compression expansion type
DCdistancecontrolled remote control
DCAdigitalcommandassembly digital instruction unit
DCEdatacircuitterminatingequipment
Data communication line terminal equipment
DCFdigitalcombfilter Digital Comb Filter
DCHdecadechorus ten voices choir
DCPdatecentralprocessor data center processor
DDdirectdrive direct drive
DDdolbydigital digital Dolby
DDCdirectdigitalcontrol direct digital control
DDSdigitaldynamicsound digital dynamic sound
DDTdatadefinitiontable data definition table
Dead strong absorption characteristics of the room of silence
DECdecay attenuate, fade, sound effects
Decibel decibel
Deck decks, audio recordings, with support added, go with institutions
Deemphasis release
Deepreverb reverb depth
De-esser went hissing is
DEFdefeat HLR, squelch
Delete delete
Deliveryend input
DEMOdemodulator modem
Automatic play Demo
Demoder decoder
Density effect of density, sound density
Detune Anor, harmonic
Spinner-in-depth DepFin
Depth depth
Denoiser Denoiser
Design design
Destroyer suppressor
DETdetector detector
Deutlichkeit definition
DEVdevice appliance, instrument
DEXdynamicexciter dynamic actuator
DFdampingfactor dynamic filter
DFLdynamicfilter dynamic filtering
DFSdigitalfrequencysynthesizer digital frequency synthesizer
DIdatainput data input
The schematic Diagram graphics
Dial adjustment dial
Difference, the difference
DIFFdifferential differential
Diffraction diffraction, diffraction
Diffuse transmission
Diffusion diffusion
DIGdigit digital
Digital digital, digital, count
Digitalyier digital device
DIMdigitalinputmodule digital input module
DIMdiminished attenuate, half tone
Dimension range, density, size, (space) dimension, the sound and image width
Din 5 core socket (Germany industrial standard)
DINdigitalinput digital input
DIRdirect direct, (mixer), direct output, redirect
Directbox instruction boxes, control boxes
Directsound direct sound
Directory directory
Direction configuration mode
Directional orientation points
Directivity directional
DISdisplay monitor
DISCdisconnect cut off, open circuit
DISCdiscriminator phase detector
Sing, record Disc, the disc
Discholder recordsDrawer
Discrecorder disc recorders
Dischage release, discharge
Disco disco, disco music effects
Discord not harmonic chords
Sing up disc Disk
DISPdisplay monitor, display
Dispersion dispersion characteristics, sound distribution
Displacement deflection, substitution
Distortion-distortion, distortion
DISTdistance distance, spacing
DISTdistrict interval
Distributer allocator, guiding device
DITECdigitaltelevisioncamera digital television cameras
Dim weakens, Darken, decay
DIVdivergence divergence
DIVdivision segmentation
DIVdivisor distributor
Diversity-diversity (receive)
Divider distributor
Divx United States digital video express company developed a pay-per view DVD
DJDiscJocker album Knight
DJdustjacket dust cover
DJdelay delay
DLDdynamiclineardrive dynamic linear drive
DLLDdirectlinearloopdetector direct linear loop detector
DMEdigitalmultipleeffector digital integrated amplifier
DMSdatemultiplexingsystem data multiplexing system
DMSdigitalmultiplexingsynchronizer
Digital multiplexing Synchronizer
DMXdatamultiplex data Multiplex (transmission)
DNLdynamicnoiselimiter dynamic noise suppressor
DNRdynamicnoisereduction dynamic noise reduction circuitry
DOdollyout backward
DOdropout signal loss
DOBdolby Dolby
DOLdynamicoptimumloudness dynamic best loudness
Dolby Dolby, the Dolby features
DolbyHxProdolbyHxproheadroomextensionsystem
Dolby HxPro dynamic margin expansion system
DolbyNR Dolby noise reduction
DolbyPro-logic Dolby directional logic
DolbySR-DdolbySRdigital Dolby Digital Dolby
DolbySurround Dolby Surround
Domeloudspeaker dome speakers
Dometype ball (speakers)
DOPdoppler Doppler (response)
Double double, twin, and occasion octave
Doubler frequency multiplier, double-
Doublespeed x copy
D.OUTdirectoutput direct output
Down, down, down, down, reduce the adjusted
DPCMdifferentialpulsecodemodulation differential pulse modulation
DPDdirectpureMPXdecoder direct pure multi-channel demodulator
DPLdolbyprologic Dolby directional logic
DPLduplex duplex, dual
DPLRdoppler Doppler (System)
D.Pohereffect de. wave El effect
Drdisplacementcorrector displacement calibrator, synchronous machine
DRdistributor distributor
DRdrum magnetic drum
Drain leakage current, drain
DRAMdirectreadafterwrite one-time reading and writing memory
Drama theater effect
DRAW a read-only memory-CD
Dr.Beat calibrator from Word time
DRCNdynamicrangecompressionandnormalization
Dynamic range compression and normalization
Drive drive, motivation
Dr.Rhythm Tempo Sync calibrator
DRPSdigitalrandomprogramselector
Digital programmes D random selector
Drum drum
Drummachine drum machine
Dry dry, no sound, direct sound effect
DSdistortion distortion
DSCdigitalsignalconverter digital signal converter
Dynamic Super loudness DSLdynamicsuperloudness bass, bass restoration
DSMdynamicscanmodulation dynamic scanning speed modulators
DSPdigitalsignalprocessor digital signal processor
DSPdisplaysimulationprogram display simulation program
DSPdigitalsouNdprocessor digital sound processor
DSPdigitalsoundfieldprocessor digital sound processor
DSPdynamicspeaker electrodynamic loudspeakers
DSSdigitalsatellitesystem digital satellite system
DTdataterminal data terminal
DTdatatransmission data transmission
DTLdirecttoline directly to line
DTSdigitaltheatersystem digital cinema system
DTSdigitaltuningsystem digital tuning system
DTVdigitaltelevision digital TV
Dual-dual, dual, dual
Dub, dub, copy copied, transcribed tapes
Dubbingmixer mixed recording mixer
Duck down in, enter the
Dummyload leave load
DUPDuplicate replication (products)
Duplicator replication appliance, doubling for
Duration duration, width
Duty load, scope, power
Dutycycle duty factor, the frequency ratio
DUXduplex duplex
DVdevice device, the device
DVCdigitalvideocassette digital video
DVDdigitalvideodisc digital video disks
DX antenna transceiver switch, dual, bi-directional
DYNdynamic electric, dynamic range, the moving coil
Dynamicfilter dynamic filtering (special effects processing)
DynamicMicrophone dynamic microphone
Dynamicrange dynamic range
Dynode electron multiplier electrode

【School】 sound weak construction project steps --- Power By 【China】 weak home network.

<br> (1) First, the pipeline and attached to embedded parts. .<BR> <BR> Embedded pieces of pipe and attached the project to determine the general need to be immediately after the start, because generally speaking, are embedded in the pipeline is not built the main stage where the ground or no decoration dolphin .wall in, if not embedded in time, it is likely to influence the progress of decoration, but must pay attention to the export pipeline is embedded must be co decoration department, or they may be due to mishandling of decorative appearance; .articulated parts embedded position and lifting strength building and technical personnel must be recognized, or security can not be guaranteed, usually buried in the cement structure needed in the pipeline to choose better quality of steel pipes, diameter cable according to the number worn by .to decide; through the roof, decorative wall pipe, generally used in PVC trunking iron or fire, mainly threading convenient construction to accommodate a large amount of cable, but also fire; for long distance pipeline laid must .To set up a certain distance from the manhole, the last must be noted that the work is almost embedded pipeline can not be changed, once you've decided where and how much buried, how to bury, and embedded after the completion, in order not to change .to be expected, so the former must be carefully embedded analysis and design, specifically the equipment number, location, power supply and control the situation, put forward on this basis, the exact line number, diameter and direction. .<BR> <BR> (2) Second, to conduct a variety of studio, frame welding and installation. .<BR> <BR> This work as cross and decoration works, because in the construction of a number of holes and the inevitable opening of the decorations have been damaged, they need to help complete the decorating department, in the welding process, we must .to have qualified workers to operate welding, this way of security requirements in addition to the main welding quality is directly related to the scaffolding lifting strength, can not be careless at the same time, because the welding construction and decoration works are usually the same time, the spot .Some flammable, so the construction must pay attention to fire prevention, to be solid welding, painting is completed, you should begin the shelf installation, the installation of security is also very important, there must be a more adequate building and technical personnel to start lifting when .; last is all of the installation pieces are reliable measures of protection must be added, so that only the installation of security guarantee. .<BR> <BR> (3) and then the following will be a variety of cable laying. .<BR> <BR> This work is a relatively simple, but it should also be seriously, in particular, to wear out of this one, can not tolerate a little sloppy, the laying of cables to grasp the moral and rational methods, such as wear and wear steel tube .The cable should be tightly and reduce rolling resistance of the first quest, if necessary, apply a small amount of oil; followed by cable damage or disorder of the trouble; Furthermore, is the time to carefully lay the cable to check the cable, like the skin is .broken shield is damaged and the wire is broken and so on; Finally, we must do a good job in laying the cable was on the mark, in order to repair the installation of equipment and future use. .<BR> <BR> (4) and then should be followed by the installation of various equipment <BR> <BR> equipment installation must be completed in the decoration, cable laying right after, for in audio and lighting equipment not only more expensive, .and many devices need to avoid contamination by dust, messy site decoration is not suitable for installation of equipment, the equipment should be noted that out of the box installation of the first to carefully check the packaging for many foreign equipment is standardized, there are a number of important spare parts or instructions .may be individually isolated in the bottom of the box, it is easy to unpacking the box together with the throw; followed by installation of equipment should carefully read the instructions before to master the correct installation methods and procedures. .For example; light bulbs and many computers are required to wear cotton coated gloves, glass installation, are not allowed to touch with bare hands; the final equipment installation is to be strong, protective measures must be in place, especially the lighting equipment, set high, the weight of large and to .regular exercise, the general and the top of the stage or dance floor, so to be absolutely safe. .<BR> <BR> (5) Last is the power lines, control lines and signal lines connected. .<BR> <BR> This is a serious need for detailed and technical work, so should be skillful and strong sense of responsibility of personnel in the line of connection, the first way to ensure that the requirements under the state without electricity, because the sound .lighting equipment, power supply requirements vary, if the installation to provide power not only to poor security, and easy to damage the equipment; Secondly, the construction meet the requirements of electrical installation practices, because the electrical installation rules to test whether a reasonable standard way, so .or not in accordance with standard construction, to quality of the project is completely different, many of the formal construction in accordance with standard engineering expert to see that job done, "beautiful"; Moreover, requiring a variety of connectors, large-scale projects .required to be a variety of two core, three core, Lotus connectors, XLR plugs, the number of multi-core non-party plug large, often need a few people while making a very long time to complete, if you do not know the correct connection before soldering methods .and welding methods, we can imagine how back Qigong to have trouble, so be sure to find out, for example: some European foot XLR audio products, and not the same as the number of general use, do not weld fault; some lighting control .requires a higher line screen, if welding is unreasonable, it is possible to produce light malfunction; last request line all the live, neutral, ground and shield connections must be accurate, the power supply, to note .are: sound and lighting equipment used by some of the power to often cause misunderstandings, for example: Some devices use 110V AC, while the transformer is a separate plug-random, and if the connection line when it is forgotten, and the power directly to the device .plug the power supply is 220V, the consequences can be imagined; another example: some of the same edge device using a low-voltage alternating current, and some they use low-voltage DC, and their appearance is very similar to the plug, and if not careful, for the .After the sound of electric light to cause a low extinction RP, sound pressure decreased, sound quality is bad consequences, but also easy to cause the device to live shell, leaving the security risks; from the screen is concerned, the system capacity of the network interference, mainly on .the system is properly shielded and shielded those who do not work is, in serious cases will be damage to equipment, while the supply line phase error may affect the speaker's phase, which has the correct level of quality and screen, often found in a number of projects: .or no shield, or the formation of closed-loop shield; either the shielded cable connection error did not form the network can not resist interference shielding, and even some engineering and construction staff will signal to the zero power, ground, shielding these lines and signal lines .essentials confusion, random access, not only not anti-interference, but also bring a lot of interference, they must first actually put these concepts to understand clearly. .<BR> <BR> (6) The other is the installation, power lines, connecting the inspection. .Because the entire system is involved in sound engineering connection points and connectors are more likely when the installation causes an error because of the individual, so careful examination is necessary, the general safety check including equipment installation, power supply .lines are reasonable, the connectors is connected correctly, etc., there is another critical test items are: carefully check the status of each piece of equipment meets the design requirements set, this must not be forgotten, or easily result in equipment damage .These states include; amplifier in the bridge request, the bridge switch is set; each device's power switch is the right choice; lights or electronic control device is a voice; address code scanners are set correctly; projector input .settings, and more. .<BR> <BR> (7) steps to be more confident that the construction is completed, the equipment should be ready to debug. .For device debugging, as each project is different, can unite a common approach, requires a separate discussion of classification, if it is to fully complete the engineering for all types of debugging are introduced, the size will be too big, here only .commissioning of engineering equipment in general simply are introduced. .<BR> A. .Preparing for Debugging Debugging sound engineering is a need both skill and experience they need to be carefully and detailed the work of the spirit, when the design and construction are in line with requirements, detailed debugging is not unreasonable, not only the design of the project can not achieve results, .but also may work in the equipment is not normal. .Therefore, before commissioning the work to fully realize the importance. .Carefully before commissioning sure each piece of equipment is installed, the connection is correct, serious inquiries to the construction workers left the construction may affect the use of the problem; debugging carefully before recognizing that every piece of equipment is installed, the connection is correct, serious inquiries to the construction workers .construction may affect the use of legacy issues related to; debugging again before the equipment carefully read all instructions carefully review the design drawings marked and connections; debugging must be satisfied before the power lines and power supply voltage without any problems; debug ago .should ensure that no on-site personnel; debugging ago but also to prepare the appropriate equipment and tools. .<BR> <BR> B. .Sound system sound system debugging debugging debugging is the key works, sound system equipment involved most commissioning the site is also most likely to encounter the most problems, so focus first to do it. .Need to prepare the equipment and tools: phase meter, noise generator, spectrum analyzer (with sound level meter), meter and so on. .Debugging steps: a separate boot, from the audio signal transmission began to gradually check the situation, this check makes sense, because only the signal transmission device in all a good amplifier and speakers will be a normal to a properly handle the signal, it .PA may have a good quality, so do this step in the work, must be patient, must be careful in this step, the speaker and amplifier connected to the first, do not worry, peripheral processing equipment is also best placed in the bypass .state. .Check the whereabouts of the signal to follow the step by step down the signal to check the whereabouts of, and gradually check its level set, gain, phase and smooth the situation, ensure that all equipment can get the best equipment before the signal level, but also .provide the best signal for the lower, while checking the signal should also check its level and gradually setting, gain, phase and smooth the situation, ensure that all equipment can get the best equipment before the signal level, but also for lower .provide the best signal, check signal in the same time, one by one observation equipment should also be working properly, is stable, meaning this is a single piece of equipment failure or unstable at this time, was easier to deal with, not .would jeopardize the safety of other devices, so that the check not be taken into the next step. .After the above is correct, it will access each speaker and amplifier system, the smaller the volume, the use of the first phase of instrument positions one by one check all boxes are the same phase, to prepare for the following commissioning, the noise generator and equalizer .access system, the spectrum analyzer is ready to begin a moderate volume equalizer access system, the spectrum analyzer is ready to begin a moderate volume to debug the equalizer equalizer, spectrum analyzer test points selected in accordance with relevant standards, .Commissioning of the equalizer principle is: the spectrum analyzer is 20Hz ~ 20kHz audio range, frequency response curve shown in the hall at the base of all test points straight, pay attention: when tested at various points on the volume to make consistent, then .Record the balance after the commissioning of the frequency position of the potentiometer; the same with a smaller volume and consistent with the larger volume, and then record the equalizer after good debugging of the frequency position of the potentiometer; similarly to the smaller volume .and the larger volume were once again testing, debugging the results of the equalizer and then recorded the final result will be some debugging data analysis, to find a variety of volume levels are measured by the frequency of the compromise position, and then .further testing, and frequency response curve depicted down the hall, the ultimate equalizer, the frequency position should be recorded, Note: The balance of debugging, the mixer frequency compensation must be placed 0, other .peripheral equipment in a bypass mode to the other should be noted that: in the usual sound engineering, considering the halls of the decorative materials absorb high-frequency signal is weak, so it can properly be made a little signal above 10kHz attenuation. .After the above steps, you should debug the electronic crossover. .Debugging can be divided divider high, medium and low-frequency alone, which divider in the system for different purposes. .Debugging methods are different, if, only for the bass speaker crossover frequency, and that as long as the equalizer in the commissioning is completed, so the bass speaker to work alone, taking the crossover at 150 bass crossover .300Hz between the appropriate adjustments to the bass signal gain, can feel the bass level is appropriate, then, together with full-range system lyrics, then the bass and the smooth full-frequency sound; if the frequency divider used in the whole system would require .exact parameters provided by the manufacturer in accordance with speaker Lou Do not set high, medium and low frequency crossover point, and then repeated for each frequency band signal gain adjustment, until the band's sense of hearing more balanced, then the light spectrum analyzer in the next step .pressure test point test case for further fine-tuning. .Equalizers and electronic crossovers to be the basic debugging has been completed, the hall began to sound pressure level should be determined, the original selected test point or points that should be pink noise source noise meter, the test in addition to full band, the .as far as high, medium and low frequency band of a few selected tests goal is: to ensure that the signal in the best dynamic of the premise, allows the system to adjust the sound of pressure in the expansion must meet the design points .sound pressure level at the same time to refer to high, medium and low frequency of the spots, and then were on the equalizer and electronic crossover slightly adjusted, if the results of the test point error larger sound pressure levels, namely, the uniformity of sound field .well, you should carefully analyzed and the corresponding improvement in the first process from the architectural aspects of construction, if it has larger defects, thus affecting the quality of the sound field, then corrective measures should be put forward feasible: If .there was no obvious defects decoration, or a certain lack of, but can not be improved, it should be from the speaker's placement, and installation in the form of points were analyzed, the analysis include: the distance between speaker and building on all sides, speakers of .mounting position between the requirements and frequency characteristics of speakers such as pointing, the following projects based on the actual speaker placement common, use of icons to install some comparison. .The following effects of the microphone and debugging, the debugging for the microphone, you can classification, vocal microphone with a cable line if there is no audible noise, sound quality is normal can be, and in its effective range of the acoustic feedback can be used for spectrum analyzer .frequency of monitoring, and make the appropriate frequency and location of records; instrument microphone cable must be used together with the East team with the debugging, and make use of each instrument model and pickup from the microphone records; wireless microphone must band together with the commissioning, .and make use of the instrument model and pickup from the microphone records; wireless microphone debugging to note: the antenna position is reasonable, let tube with the position appears dead (well log), receiver gain of the signal level to be appropriate .may be, the best place to fine-tune the noise to be repeated to find other, for the effects of debugging, the principle is to ensure that the input signal gain can be of better dynamic effects, sound signals, and to leave a certain margin, .effect of mixed-signal output is set according to demand. .As for the effects of the specific effects of selection and parameter setting, should make some rough tests, and then selected according to the requirements of the program, just need to note: effects of reverberation time and the amount of the delay in the transfer no more than set .a certain range, so as not to affect the language of clarity and continuity of the signal in the microphone and effects of debugging, the system should also include the debugging back to listen to in principle is: Let the system's frequency response back to hear the main sound reinforcement system with the same ., the sound pressure level actors (including the band) could clearly hear the voice of their subject, not too big, can not bring additional sound feedback. .Pressure limit for debugging, it should be more than devices in the system and then set the basic tone, usually in engineering, the pressure limit the role is to protect the amplifier and speakers, and to the sound box, and to change the sound smooth, so .first to set the compression when debug level start, usually do not set too low, too high of course, will also reduce the protective effect of the specific settings should be, as the various pressure limit adjustment range and signal the case may be, and secondly to .Set up and recovery time compression, usually start-up time should not be too long, so protection action is not timely, and recovery time should not be too short, so as to avoid damage to the sound effects; Another thing to set the compression ratio, the general project design, including 4 .: 1 or so, pressure limit of the noise gate it is set to pay attention: If the system is not large noise the door closed; if there is some noise, noise gate threshold can be set at a low level at, so as to avoid expansion .the phenomenon of intermittent acoustic signal, if the system noisy to be analyzed from the technical aspects of construction can not be solved alone by the noise gate, and other settings can be set according to different requirements of the surface. .Other devices one by one for detailed debugging is no longer, in general, the principles of debugging, you must carefully read the product description, and gradually and carefully fine-tune the sound not undermine the basic premise of field conditions, selective use of audio processing .equipment to meet the design requirements. .<BR> <BR> C. .Lighting system debugging <BR> <BR> traditional stage for the complex lighting system, which will involve the characters and sets the stage lighting and lighting needs styling, so this regard include the debug color of light, color, color temperature, brightness, .projection range, sets the scene dimming, sequence editing and other aspects of the program content, not the usual simple debugging utility works best, like sound systems, but also a serious need to have a lot of debugging to complete, or, as mentioned earlier .as, the traditional complex lighting system design, construction and commissioning, the best in professional design institutes and professional performance units with the help of the general lighting system debugging sound engineering, due to the requirements of any professional performance venues .strict, so debug technical specifications involved in small, relatively speaking, less complex lighting system debugging, but which also has the technical requirements than the traditional technical indicators much stage lighting, lighting system debugging relatively less complex .However, where there are technical requirements than the traditional stage lighting technology, that is: sound engineering involved in many practical computer lights, so the engineering and technical personnel should seriously study in this regard. .First of all, should carefully check the operation status of each device separately, because the computer system of internal control lights and mechanical parts of more sophisticated, light power consumption power, and protection measures are relatively perfect, so if due to shipping or installation causes the internal control components .or bulb damage, the computer lights generally do not work, but want to confirm such a complex lighting system, the faulty computer is too much trouble and fault lights, so as to be connected or installed in the system check before each device separately .situation, this can be both light and check the check the purpose of the console. .Secondly, we must correct the lighting settings. .All the computers can be said to be in the right light settings to work properly, so in order to unit and system state in the normal and orderly, the correct settings are very important settings include: the form of lighting control, power .modes of supply, range of motion, lighting the address in the system, the control terminal of the processing line, where the location of lamps in the system configuration errors often occur in the project, its setting is the choice of the address code ., that is light on the DIP switch must be in strict accordance with product instructions form provided for, can not act in haste. .In addition to the lighting control device is set. .The most prominent feature is the scanner, there is a corresponding need to set the correct control device to control the operation, if the improper selection of the console, set unreasonable or fails, the computer lights not working, or even not work, especially complex .lighting system control equipment to work in the light plays an important role, and therefore must be set on the device, the set includes: forms of control, the control signal output, the lamp type and quantity, the control program software .content and so on. .A final note on: In the above steps completed, the action needs to be checked again and the computer light controller movements are the same whether it is normal and so self-lighting, in addition to: pay attention to lighting systems and audio systems without interfering with each other ., and if so, record the time and drying equipment and the specific model, in order to facilitate the future solution. .<BR> <BR> D video system debugging in general, sound engineering, video equipment, the number and complexity is not too big, so debugging it is relatively simple. .First to set up displays. .Because of restrictions on the installation environment is often difficult to accurately according to the product of the distance requirements for installation, so the need for debugging in the project to adjust and set the display device, this can also make camera, editing equipment, an accurate debugging .reference works in general, the adjustment of the display device is mainly the adjustment of the projector, high-speed include: high-speed image distortion, etc., even for a multimedia display for line frequency and field frequency and field frequency adjustment .Of particular note is: is the image distortion of the adjustment, if environmental conditions are not met, we must make full use of the projector's "inclined to vote" function to make up, for example: RCF of 4001 to have the projector functions as shown below .: Second, we should be recording, editing and distribution of equipment debugging. .Because the camera device in different working conditions and working environment, there will be a large difference between image quality, so after the completion of work on the camera equipment should be uniform adjustment, the adjustment must refer to the same display device, in the same scene in different light .under, the adjustment include: head and controls the range of activities, the lens focus, white balance adjustment, sensitivity adjustment, the adjustment of the output format, etc., editing and distribution equipment, including debugging, adjusting the signal input and output .The format, select the character of the format. .<BR> <BR> E. .Overall the system debugging when debugging has been completed, respectively, and confirmed that all equipment in good condition, no obvious debugging is not the time to start the whole system should be fully debugged and tested separately for each device of each system is different is that the overall comprehensive .commissioning site specific adjustments not clear, it is primarily the task of coordination in the operation of the system, check some of them are interrelated and coordinated the work, check whether their work will have a mutual influence and interference, for example: check the video switching .will provide sound system with noise, check the sound system of voice control of lights, check the lighting system dimming action is in the sound system would interfere with and so on. .<BR> <BR> F. .System simulation run the system debugging has been completed, the formal process must be carried out before running the system simulation is running, no matter what the size of the audio system, and its relatively large number of devices, the status of the work varies, in addition to the system equipment .inevitably uneven quality and stability of work, commissioning the project in a short time, it is difficult to discover the hidden or less, but once after the completion of the actual system much longer running time, there are often over time, over .the phenomenon of load operation, when the system already exist but not yet identified risks and weaknesses, it is possible to rapidly expand, both to users and adversely affect the project to simulate the actual running is to run in a similar environment, understanding .system, working conditions, identify problems before they occur. .First of all the systems to measure the overall run-time operation and a separate power supply line of each phase current. .Although the design and construction of the power supply line to the corresponding requirements of the current distribution of each phase has also been a general understanding, but the actual operation will certainly be different from the theoretical value, in order to be aware of, foolproof, .actual operation must be measured when the current situation, the general flow sheet can use the clamp points on the time of each phase, the number of minutes to run the device were measured, the actual measured value and if we find there is a wide gap between the theoretical value, or the ratio of the phase current .the larger the gap, or a line current extraordinary situation must be re-rectification to ensure the safe use of electricity. .Second, we must check all equipment at full capacity when running and long running job stability. .Professional audio sound system and a larger non-professional distinction, is that they run at full load conditions and for a long time, showing different job stability, job stability has become an important professional audio and lighting equipment performance. .But even with a professional equipment, among a larger difference in stability of the work, and some equipment in a very bad environment can still work, some devices are in a long time worrying. .These checks include: changes in sound, lighting control performance changes, the stability of the wireless microphone frequency and battery when the acceptance is not sufficient, the equipment, working long hours and noise circumstances. .But should be noted that: the work of the inspection is to ensure stability in a reasonable environment, equipment, the premise is not to check the deliberately poor working conditions or equipment to make the device work in abnormal condition, caused by the equipment to do so .damage is not warranty. .Finally, check all equipment is running at full capacity heating and long run-time situation. .Sound system equipment, power equipment, basically, there will certainly be in the operation of different degrees of heat, especially as the power amplifier, lighting, high-power devices like the camera, usually fever cases are more obvious, so to some extent .heat on the phenomenon, not equipment and systems, equipment safety consequences. .However, if the installation did not keep proper space for heat dissipation, or the device itself in the long, heavy-duty heat dissipation running bad, then that to be resolved, otherwise the light were to produce a protective device, causing heavy damage to the equipment. .Equipment within the normal scope of work if a serious fever, be sure to equipment replacement; if no suitable space and equipment cooling large heat, forced ventilation should be considered, and to clearly tell the user; to conduct regular dust cleaning and maintenance of equipment .. .Also need to add is: generally running in the simulation with different loads, test run the system at different times, and further the work of inspection system security and stability. .In short, the system is very important to run the simulation work is necessary, then every device will work in exchange for long-term operation stability and security of the system work. .In particular, heat supply lines and equipment status, will be directly related to the project's safety and should therefore lead to all engineering and technical personnel are highly valued. .<BR> <BR> G. .Commissioning results and problems to the record because the sound engineering for debugging, set and check a lot of items, and these results and problems is important for future use and maintenance of reference materials, it is necessary to work during every step of recording the results and problems .down, and then make the necessary analysis and summary. .For useful to the users of data, should be handed over to them; useful for future maintenance record data, you should take good care of by the designer. .Record results, including: equipment location number, the device setting the state, when debugging the test data, edit information related procedures, etc.; records include: equipment, work environment issues, equipment interference, equipment operating conditions .issues, and sound work-related issues but the impact of system operation and so on. .<BR> <BR> 4. .Problems in the project as a complex multi-technology sound engineering types of projects that may occur during a variety of problems, combined with sound and lighting system, a larger number of equipment types, and the system's technical requirements vary, so the .kinds of problems occur is inevitable, usually will encounter some difficult problems. .According to the characteristics of sound engineering, engineering design quality and progress of the project played a major role, so long as serious in the construction in accordance with the specifications designed and generally not in the difficult problems encountered during construction, or that these .difficult problems will not be reflected in the construction. .In most of the time, the difficult engineering problems during the commissioning phase, and even use some time after the show. .Since it is a difficult problem to solve is not easy, often racking their brains to check for a long time, always remain; at some time the problem somehow disappear on their own, and do not know when they happened, which makes the person a headache, .Each must have engaged in sound engineering and technical work of people will have different levels of experience. .But despite these difficult problems is the performance of a variety of forms, but as long as the design is not wrong to say that root causes can be only one; omissions caused by the construction sectors. .So, even difficult problems, or can be solved. .Here are some typical troubleshooting common problems. .<BR> <BR> (1) equipment enclosure with an electrical phenomenon that all the sound engineering equipment must be electric, it may first encounter when debugging live shell part of the equipment problems, although the case does not affect the use of equipment charged, .but will endanger the safety of users must be thoroughly addressed. .<BR> <BR> (2) Debugging the sound system volume less than the volume of sound frequently encountered always small, less than the design requirements of the phenomenon of sound pressure level, which indicates that the installation and setup of equipment problems. .<BR> <BR> (3) sound field resonance and feedback although the design and construction have been seriously considered, but inevitably there are not comprehensive and unexpected places, and that this problem must have influenced the occurrence of normal use .and should be eliminated. .<BR> <BR> (4) noises interfere with sound engineering time encountered a lot of noise interference, the occurrence of different reasons, usually very cumbersome to solve, but as long as careful analysis, looking on from the system's construction .reasons, the stepwise analysis, the problem can always be resolved. .<BR> <BR> (5) lights out of control in the sound engineering in the light occurs movement of people sometimes uncoordinated and without the controller and the occasional error control actions such as, though sometimes slightly out of control will not bring a big impact, .If the problem is not solved, however long the fault is likely to further increase, while the light show with a malfunction in the works not be tolerated. .<BR> <BR> (6) light bulbs are often damaged the computer though the damage is normal bulbs, but use a very short time if the damage occurred, there should be a normal phenomenon, especially the price of computers are generally more light bulbs .expensive, less frequent replacement will increase the cost of large, good quality of life of the computer light bulbs should be 750 hours or more generally, if not robust operational errors caused damage to the lamp, the use of time than this requirement should be to find out. .<BR> <BR> (7) video images are not normal professional sound engineer, video transmission distances longer than normal, usually the signal has to go through after the video processing and distribution, to give more than one display device, the middle part will be more .may be due to different causes of poor quality video image and affect viewing, so it should be processed. .<BR> <BR> (8) wireless microphone sound instability in the majority of sound engineering are now equipped with a wireless microphone, but due to improper installation and commissioning, with a significant number of poor, especially in live performances, the work of the wireless microphone .situation will directly affect the quality of the show, so this is a problem can not be ignored. .<BR> <BR> <BR> <BR> <BR> <BR> <BR>.

【 Weak current College 】 professional audio terminology in English (9)

Kkey key
Karaoke karaoke without accompaniment Orchestra
KBkeyboard keyboard button
Kerr effect, Meckel (readable and writable CD) magneto-optical effect
Key, press the voice key
Keyboard the keyboard button
Keycontrol keying, tone control
Keyed keying
KeyEQ tone Equalization
KHzKiloherts kHz
Kikll clear, elimination, suppression, attenuation, disconnect
Killer suppressor, circuit breaker
Kit set
Knee compression device inflection point
Knob buttons, knobs, regulator
KPkeypulse keying pulse
KTVkaraokeTV mixed singing TV (programs)
KXkey keying


Lesion of failure, damage
Leslie, Lee
(A phase modulation effects processing)
LEVlevel level
LEVCONlevelcontrol level control
Level level level level,
LFlowfrequency LF, bass
LFBlocalfeedback native feedback, local feedback
LFElowfrequencyresponse low frequency response
LFOlowfrequencyoscillation-frequency oscillation signal
LGDlongdelay long delay
LHlowhigh low noise high output
LHlownoisehighoutput low noise high output tape
L.halllargehall Hall effect
Lift lifting (an elevated ground potential)
Liftup rises
Labial lip tone
Lleft left (stereo system left channel)
Lline line
Llink-link
Llong long (time)
LAlaser laser (laser)
Lag lag lag
Lamp lamps, lighting
Land CD spiral road shoulder, grounding, really
Lapdissolve slow conversion
On-off switch LappingSW
Large, large
Largehall Hall reverb
Larigot six times the sound
Laser laser (laser)
Latency idling, standby
Launching incentive, emission
Layer stacked control, multiple sound synchronization control
LCDliquidcrystaldisplay LCD display
LCRleftcenterright friendly
LDlaservisiondisc VCD DVD player
LDload load
LDPinput DVD input
LDTVlowdefinitiontelevision
Low resolution digital TV
LCDprojictor LCD projector
Lead channel, front panel, enter the
Lead-in inlet
Leak leakage
Learn Learning
LEDlightemittingdeivce emitting radiator, light-emitting diodes
Mmain main channel
Mmaster master
Mmemory memory
Mmix mixing
Mmoderate moderate
Mmusic music
Macmanchesterautocode Manchester automatic code
MADImusicalaudiodigitalinterface audio digital interface
Main main, main line, the main channel, power
MAGmagnet magnet
Magnetictape cartridges
Magnetictyperecorder tape recorders
Main power supply, the main
Majorchord big three chords
Make up, closed
Makeup is switched on, matching
Male plug, plug-ins
MANmanual manual, manual
Manifoldtechnology (speaker) more manifold technology
Manipulate, keying
MANP manual insertion
Manual Manual, manual, manuals, brochures
March March
Margin Margin (level)
Mark logo, symbol, mark
Mash down, crush
Masking masking
Master master volume control, sound mixer, master, standard, main road, always
MARMatrix matrix, mixer matrix (M), group
Match match, adaptation, pairing
Matrixquadsystem matrix quadraphonic stereo system
MAXmaximum Max, Max
MBmegabytes megabytes
Mb/smegabytespersecond megabytes/second
MCmanualcontrol manual, manual control
MCHmultiplecHorus multi-channel chorus
MCRmultiplecjhannelamplificationreverberation
Enhanced multi-path reverb
MDminidisc optical disk player, small recording sing up
MDmovingcoil moving coil
MDLmodulationdelay modulation delay
Measuring range, MEASmeasure, test
Measure pieces of that section
A brief summary of the Edit Measedit
MECHmechanism mechanical plant
MEDmedium is moderate, intermediate (shift)
Medley mix
Megabass Woofer
MEMmemory memory, storage, and memory
Member, Member
Menu menu, table of contents, table
MEQmonoequalizer Mono equalizer
Merge Merge, summary, fusion
Meridian vertices, peak
Measure summary
Megaphone megaphone
Mel-us (tones)
Menu menu listings
Message communication, contact
Metal metallic (results)
Metaltape metal tape
Meter level table, table-header, the instrument
Metronome metronome
MFmatchedfilter matched filter
MFmaveform waveform
MFmiddlefrequency MF, baritone
MFLmultipleflange multilayer flange (chrome) effect
MFTmultiplprogrammingwithafixednumberoftasks
Task a fixed amount of multi-channel program design
MICmicro Micron
MICmicrophone microphone, microphone, microphone
Michcholevel microphone reverb level
Micromonitoramp micro audio monitor amplifier
MICROVERBmicrocomputerreverb microprocessor reverb
MIDmiddle middle, middle, baritone, intermediate frequency
MIDImusicinstrumentdigitalinterface
Electronic musical instrument digital interface
MINminimum min, min
MINminute minutes
MINDmasterintegratednetworkdevice
Integrated network total device
Minitrim fine-tuning
Minitrue microcomputer adjustment
Minorchord primary three chords
Mismatch mismatch
Mistermination Terminal mismatch
MIX proportion of mixed, volume adjust
Mixer sound mixer, mixer
MMmovingmagnet moving-magnet
MNTRmonitor monitor
MNOSmetallicnitrogen-oxidesemiconductor
Metal nitrogen oxide semiconductor
MOmagnetooptical can erase recordable CD
MOCmagnetoscillatorcircuit master oscillator circuit
MODmode status, fashion, models
MODmodel models, styles, model, typical
MODmodulation modulation
Mode status (music) melody
Modeselect to select
Mush, harmonic noise interference
Musharea bad reception area
Music music music
Musiccenter Music Centre, phonograph
Musicconductor music controller
MUTmute mute, mute sound, noise control
Muting control, eliminate
Multiple complex, multiple, multiple
MVmeanvalue average
MVmultivibrator multivibrator
MWmediumwave MW
MXEmonoexciter Mono actuator
MXRmixer mixer

【 Weak current College 】 homemade projector utility maintenance technology information (1)---Power By 【 China power house network 】

First, the basics of the projector
In order to repair the projector must be aware of some of the most basic knowledge, including CRT, LCD, DLP projection technology works and the meaning of the parameters so that maintenance personnel have a more comprehensive understanding. LCOS projector is not a mainstream products and is not covered.
1, CRT projector works
CRT projector and three guns cathode ray tube projectors, it mainly consists of three CRT tube, electron gun deflection coil and tube Panel. In order to make the CRT tube display images on the screen, the CRT projector to signal input signal decomposition to R (red), G (green), B (blue) three CRT tube screens, projection to gather in large screen displays a color image.
CRT projector according to the CRT tubes in different diameters can be divided into: 7 inch tube, 8-inch pipe, 9-inch tube projectors. CRT projector display image rich colors, restore good, has a wealth of geometric distortion adjustment capability, the disadvantage is the low brightness, manipulate complex, bulky, environmental requirements for the installation.
CRT projector of two specific performance indicators:
1. convergence performance
Convergence is the R, G, B 3 colors on the screen in a fully coincide with the CRT projector, convergence control appears especially important, because it has an R, G, B three CRT tube, the parallel installation in brackets, in order to achieve the image fully convergent, must have the image of various distortion correction. Machine location changes, and even a small change, convergence has to resize, so on a converging adjustment request is fully functional and convenient. Convergence have static and dynamic, dynamic convergence with tilt, bow, amplitude, linear, trapezoid, Pincushion, and other functions, each of these features are available in horizontal and vertical two directions. In addition, may also conduct non-linear balance correction.
2. focus on performance
CRT'sfocus method can be divided into power focus and physical focus. We know that the graphics of smallest unit is pixels, pixel smaller graphics resolution is higher, but the CRT tube, a minimum pixel is determined by focusing on performance, the so-called recordable address resolution, which is the minimum number of pixels.
While the focus is divided into static electricity focus, magnetic and electromagnetic composite focus focus. With more advanced electromagnetic composite focus, its advantages are good (but high-luminance conditions would defocus), and focus on high precision, you can focus on regional focus, focus, the corners of the edge so that you can do every point on the screen is very clear. Its working principle figure 1:
2. LCD projector works
LCD projector, LCD projector, the core components for the LCD Panel, a passive glow and Imaging. The so-called LCD i.e. between between liquid and solid substances, which itself does not glow, work material governed by the temperature influence is very big, its working temperature is-55 ° c to 77 degrees centigrade. Photoelectric effect using LCD projectors, that is, the arrangement of liquid crystal molecules in the electric field changes, affecting its LCD unit of transmittance or reflectivity, thus affecting its optical materials, produced with different grayscale and color images. LCD projector is divided into single-chip LCD and three slices of LCD machine, a passive way, using the external projection of the light metal halogen lamp and UHP, UHE (cold light), exposure and display images, general import single-chip projector uses liquid crystal panels for special LCD panels, and domestic low end projector with LCD panels are used to produce LCD monitor of second-hand LCD, used as a projection of the backlight can be withdrawn. This LCD is true colour TFT and pseudo color STN, making the best choice when the projector TFT true color playback screen guarantees, because the true color display image colorful, nature and sense of depth.
Three LCD panels projector principle is the optical system to light through the formation of the three RGB light beam splitter, exposure to RGB tricolor LCD panels, signal source through the ADC, and then added to the liquid crystal panel, through the control panel unit opened, closed, so as to control the on/off light path, RGB light last in a cross-directional prisms in convergence, by projection lens projection on screen color image formation. At present three LCD machine is the main LCD machine models, with the development of science and technology, three slices of LCD panels dimensions are smaller, smallest 0.5 inches, the total volume is more compact. And single-crystal machine small size, light weight, operation, easy to carry, lower prices, but his short life of light source, color is not uniform, resolution is low, so the current import professional single-chip LCD projector is fading out of the market, replaced by domestic low end projector market.
Import single-chip LCD projector works as in Figure 2:

Triple LCD projector works as in Figure 3:

Weak current College】 【speaker burning problem analysis.

First is the bass driver catches fire, in fact, the driver and the divider can fire because of their own quality very, very good. On this view, usually the owner will not be accepted. To this end, we specifically to examine the reasons, because the driver from the sound input to the voice coil itself after several road, electrical connections, the wound voice coil itself though is a line from beginning to end with no interface, but the entire voice coil line in the drawing process there is always a location may be in the Middle will produce some uneven. Therefore, typically current throughout the voice coil wire in different parts of the current density are strong or weak difference, voice coil with pin connection point will likely lead to poor contact between the contact resistance increase, all these factors result when added to the speaker's power continues too large, more than the rated power toleration speakers, this loudspeaker unit electrical loop a weak link in a crash occurs.

In other words, Horn, electric loop open burning, the speaker's bass section will stop working, no sound!, this is a normal situation, however, very occasionally, there will be a speaker, originally appear weak links in section does not appear, the entire electrical connections loop they are very strong (i.e. the quality of the speakers from head to tail do very well). When added to the speaker's power continues too large, more than the rated power toleration sound, it should be no blow blowing, however, have very high temperature voice coil, usually you can reach several hundred degrees Celsius, and now some voice coil skeleton material itself can withstand very high temperatures, no deformation of the voice coil (voice coil skeleton deformation will be met and the voice coil with magnetic circuit resulting in damage to the burnt voice coil).

This situation persists, the continuous high temperature voice coil pots drying with paper (paper trough bear several hundred degrees), this is the driver is on fire. If electrical loop can burn off road early, voice coil is hot, no opportunity to bake a cone, and treble unit-film is often not combustible, treble does not catch fire. Therefore, for the bass driver catches fire, we don't have a cow, you need to make patient explanation. But very strong overload may rapidly destroying the driver's voice coil and dividers, usually does not cause the fire because they may be too late to burning hot has burnt out, this is why our analysis on fire to note problems.

Alternatively, speaker internal fire is a divider hot ignite speakers inside other materials, but before the result is a driver (also includes treble unit loop) electrical connections open, have not been timely detection of, and continue to transfer the high-power signal; divider inside L/C (inductive/capacitive) crossover network is connected to the speaker load must be before forming the "filter" properties of the network, you can put the whole band audio signal according to the different audio segment is assigned to the corresponding driver, to distribute the signal of that once the driver open burning, electrical connections. In other words, there is no crossover network load, this time in the Horn of crossover network becomes an electrical "series on the notch network" circuit, amplifier output connections is an inductance and capacitance concatenated to form a network of notch in the audio signal to a frequency on very low impedance, approximate short circuit, but also not really short circuit, which may not be able to trigger the power amplifier circuit protection.

If the amplifier without overload protection actions, continuous rushed to the strong current divider will cause the inductance coil heating, if the inductance coil winding and enough crude (that is, its own quality very good), a short time is not blowing, then have the opportunity to take it around the ignition of the material. If inductive or capacitive fragile, the morning was a strong current completely destroyed, the divider is not heating ignition speakers. Only damaged power amplifier (for example, the output appears DC) while damaging the bass driver, but does not make the divider overheating on fire because the inductance capacitor network not by DC.

From the above analysis, to completely avoid speaker on fire, somewhat more difficult, although it is no accident. To avoid it to happen, we must strictly observe the following rules:

1. avoid system overload, speakers and the amplifier's power reserve must be adequate, it is absolutely fundamental to effective solutions, whether that situation of fire are caused because of overload.

2. regular checks sound system, ensuring that each speaker is normal. Very often, the speaker of a large number of damaged because no timely examination system caused when a speaker burn out, resulting in lower overall sound pressure, then by increasing the total volume to compensate for this and increase the burden of the other speakers, then damage, this vicious circle, speaker damage more and more, individual "quality"-good speakers might appear on fire.

3. avoid excessive volume, on-site sound sense of shock and not by simply increasing the volume will be able to do so, typically, sound pressure in 105 ~ 110 decibels is very adequate.
4. the speaker setup, avoid surrounding combustible materials, to avoid speaker fire ignited by the surrounding environment. Remind owners fully ready to fire safety work, after all, the industry is their own, this money can not be province.

In the speaker system work in case of ignition occurs. This often leads to consumer fears, but also to project developers a lot of trouble, in this case, the owner usually immediately finds the sound quality is too low. So, on this phenomenon have a correct understanding of the very necessary, it also helps prevent the fire from occurring.

Speaker on fire in General is the bass driver cone ignition and speaker internal fire, then further other parts ignition speaker on fire, two fire situation has the potential to cause other fire, we start to analyze the cause of the fire box.

【 Weak current College 】 on-site performance control---Power By 【 China power house network 】

Field manipulation

On site during the performance, I would like to focus on sound engineer and interface problems between the band.

Performance should give each of the musicians have a Shih-3 ^} SdB's allowance. Also is to allow each of the musicians on their voices for the lifting or attenuation 3dB (maximum of 6dB) this point is very important, otherwise the same will occur, resulting in the sound effects to lose balance. Many musicians like own volume control their own voices, they often say: "bring me up a bit, I'll control your size". From the overall sound balance control, this is clearly unreasonable, will make the sound engineer was unable to control the entire balance of the sound field. They often want their voices to the others, you just put the guitar accompaniment down to a suitable location, the results of the guitar hand feel small, he also put the volume to the lift! keyboard player and bass player nor weakness (don't forget, they can have a volume control) can imagine such a loop indefinitely!, singer only shout! remember one thing: the entire performance of the maximum level benchmarks should be based on sound field of audio gain prevail! said popular, also be with singer microphone volume is subject (including acoustic musical instrument microphone). Other musical instruments of reference to failure ranges considerably, while the microphone is not. Therefore, the performance for each of the musicians have a dynamic and margin must not be too large. Worthy of note, because the musicians performing on the stage and general location (main speakers in the rear), so he heard voices cannot be the main sound field effect, so it is not accurate.

So, how do you meet musicians? musicians is the body of the performance, good sensory is indispensable. This is the show to hear also put forward higher requirements. Specific method is to assign each one to listen to the musicians, in each case, return to hear his voice tune into than others are larger (this can be sent by the secondary sound mixer to get signals), so that musicians will have good on-site feeling, more conducive to the full. As for the a bit special, the drummer of jazz drum General at least four microphone (snare, kick drum every one, tong drum two only), if you want to return to listening, drummer very prone to Whistler, the best way is to wear headphones so that the drummer will not only benefit the drummer's play, the acoustic field will not cause interference.

In addition, as a sound engineer, in the show not only to ensure on-site performance results, you should protect the safety of the device. There are now often heard that sound been burnt phenomenon, not only will it bring to the Organizer, or economic loss to the on-site performances bring great trouble, serious or even interrupt the performance, the consequences can be imagined. You know, the device's security completely in your hands!, of course, a sensitive ear and an always keep a cool head is also indispensable. For example, some system design itself is not enough of sound power, plus you have to put pressure on the leadership, forcing you to make you turn up, at which point you may want to reason about! performed to and at the expense of costly equipment, this is obviously a bad idea