Weak current College】 【personal audio debug methods and procedures.

Sound engineering for debugging is generally divided into system debugging and debugging, where the sound introduce system debugging steps, the following system debugging step is I generally use, to share with you.
1. line check: in accordance with drawings, carefully check the line connection, verify that there are no problems.
2. set the initial state of the device, the power amplifier input is set to a minimum, include all peripheral equipment of input and output knob is set to 0 DB position or intermediate position. Follow the former to back-order power (to not open the amplifier), check that all equipment power normal to the amplifier power.
3. preliminary check system status: proper turn up the amplifier gain control, CD in a familiar music and adjust the input level to basic mixer in the normal position. Slowly push up a bit mixer faders, listen to speaker sound properly and that it is distorted, if not properly shutdown check immediately.
4, speakers and system polarity detection: System basically normal, open all device power, reactive power discharge flat set at maximum, pull down the audio mixing console output faders, phase meter generator access mixer input channel, open phase meter power adjust the output gain and mixer input gain to a mixer indicates the table is 0 DB. Slowly push up mixer output faders, speaker of the "bang" sound to reach adequate loudness (loudness is insufficient, the test results are sometimes inaccurate), phase meter detector checks whether each speaker and the speaker phase or the specification of a description. When it is best to close other detection of speakers to prevent interference detection and more accurate, one by one. If you are not working properly, check the speaker cable is reversed or system connector is inverted. Switch or replacement and testing.
5. phase adjustment: If you use the SLF and wide-band combinations, because of the existence of crossover system as well as the installation location, there may be a crossover frequency interference or delay time different problems caused by phase, so you will need to phase adjustment. Pink noise (PINKNOISE) generator received a mixer input channels, adjust the level to normal position and phase meter test microphone is placed in the middle of the venue, and the location of the sound into equilateral triangle. Push up the mixer output faders, check the spectrum analyzer screen in full-frequency and low frequency sound frequency frequency bands are there near the Valley of the point appears. If you have to upgrade the corresponding frequency band equalizer, if upgrading is not, is there a phase. A phase problems have a direct impact on the quality and use Equalizer simply resolved. To resolve the problem you need to adjust the phase divider of phase angle or the delay time between the speakers. Adjustment, look at the Spectrum Analyzer display, first adjust the low frequency divider phase angle to see if it needs to improve, if you have improvements, determine the best value and then adjust the delay time, delay time to adjust to the situation, if the low-frequency speaker distance seat near, you will need to adjust the bass be delayed, is also a look at the spectrum analyzer screen, adjust the delay time to try to ping the curve. The phase noise reduction to a minimum.
6. frequency balance: finished the above adjustment, you need to adjust the system's frequency response curve. The spectrum analyzer test microphone is placed in the seating area and a place to play the pink noise, watch the Spectrum Analyzer displays, defective parts, using the equalizer. And then to test the microphone placed in different places, then, in turn, transferred balance, many changes in several locations, repeatedly adjusted balance so that all regions of the frequency response curve as possible straight, even if the equalizer is generally good.
7, dynamic control device regulation: General dynamic adjustment of equipment is the compressor, limiter, if that is the concatenation of chain connection in system, are generally used as a protection system, mainly use compression for limiting functionality. Limiter settings I normally do: compression is set to passthrough (BYPASS), input/output gain set to 0 DB, the compression ratio is set to "Infinity", then a mixer send pink noise signal, gradually pushing large observation power amplifier input level indicator, indicator is lighting if the clipping indicator (CLIP) is lit. Access to press for the adjustment knob, so that the start level power amplifier input clipping indicates off. Then put a mixer output upgrade 6 DB or give output level led to + 6 DB, then emphasise that start level so that the power amplifier clipping LEDs just start blinking. At this point, the system of debugging is complete, as for the sound tuning and effect processes (including effects, Exciter, etc.) generally belong to the tuner to the task. Of course, in sound engineering, which is normally provided by audio company technicians to do.