Debug sound engineering general debug for system debugging and sound, here introduce the system debugging process, the system debugging steps I generally use, introduction to share. The first step in sound engineering commissioning:
The system level debugging
1, line inspection according to system configuration connection drawings, carefully check the line connection, make sure no problem.
2, equipment set the initial state to the amplifier input is set to a minimum, the input and output knob all peripheral equipment is set to 0 dB location or middle position. According to the order of magnitude of the electricity used to post (first without amplifier), check all the equipment electricity is normal, to a power amplifier power.
Gain control of 3, the preliminary check system state appropriate open power amplifier, in a familiar music CD, adjust the mixer input level to the normal position. Slowly push up a little console fader, listen to the sound from a sound is normal, whether the distortion, if not normal immediately shutdown inspection.
Polarity detection system 4, speakers and system basically normal, open all the equipment power supply, power level settings at maximum, pull the console output fader, phase instrument access mixer input channels, open phase meter power to adjust the output gain and mixer input gain to the mixer indicator is 0 db. Slowly push the console output fader, sending out of box of "bang" sound to achieve adequate loudness (if not loudness, the test results are sometimes not accurate, consistent) described by phase meter detector check each speaker is in-phase or speaker instructions. Testing the best time to shut down the rest of the speaker, to prevent interference detection more accurate, one by one. If there is not normal, check the speaker line is reversed or system connecting line is reversed. Switch or after changing detection.
5, phase adjustment if simultaneously using ultra low frequency and frequency combinations, because OFDM system existence and installation position, the phase problem may be cross frequency interference or delay caused by different, so the need for phase adjustment. Pink noise (PINKNOISE) generator to the mixer input channels, adjust the level to the normal position, test the microphone phase instrument is put in the middle of the venue, the equilateral triangle and the position of the speaker. Push up the console output fader, check the spectrum analyzer screen near full frequency and ultra low frequency sound frequency bands have appeared valley. If the corresponding band, enhance the equalizer, if not to upgrade, is the existence of the phase problem. Phase problem will directly affect the quality, and it solves the equalizer. To solve the phase problem between you need to adjust the frequency divider phase angle or sound delay time. Adjustment, look at the spectrum instrument display, phase first adjust the frequency divider angle, have a look there is no improvement, if there is improvement, determine an optimal value and then adjust the time delay, delay time adjusting to see the scene, if low frequency sound box seat near distance, we need to make time delay adjustment on bass, also look at the screen to adjust the delay time of spectrum analyzer, makes the curve to a point. The phase noise is reduced to a minimum.
6, the frequency equalization in the regulation after the above, we need to adjust the system frequency response curve. A position measurement microphone spectrum analyzer on the seating area, playing the pink noise source, watch the spectrum analyzer display, the defective areas, to be corrected by the equalizer. Then test the microphone in a different place, which in turn EQ, multiple changes of several position, repeated adjustment and balance the frequency response curve of each region are as straight, even roughly tuned equalizer.
7, the dynamic control device adjusting device is a limiter general dynamic, limiter if chain series connection in the system, are generally used as a protection system, so is the use of limiter function limiting device. Limiter settings I generally operated: limiter is set to direct (BYPASS), input and output gain is 0 dB, the compression ratio is set to "infinity", then the mixer send pink noise signal, pushed, observe the input level power indicator light, when the clipping indicator (CLIP) light after the. Access limiter, regulating start level, the power amplifier input clipping shut. Then the console output increase of 6 dB or let the output level indicator to + 6 dB, and a start point level, the power amplifier clipping indicator just began to flicker can be. So far, the system level debugging is completed, as for the tone adjustment and effect of treatment (including effects, exciter) belongs to the tuner's task.
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