在我们平常接触济南音响的项目调试中，很多时候会遇到以下问题：
In our regular contact Ji'nan audio program debugging, often encounter the following problems:
1、噪声问题；主要表现在扬声器在无音源的情况下有杂音，噪音或者电流声。
1, the problem of noise; noise is mainly manifested in the loudspeaker in the absence of sound source under the condition of current noise or sound.
2、啸叫问题；主要表现在话筒增益提不上去或者音量提不高，会发生声反馈而产生啸叫。
2, howling; mainly does not put up or volume of not high on the microphone gain will occur and the whistling sound feedback.
好了，客户给我们反应了这样的问题。我们“哒哒哒哒”，很快就跑去客户那里一看，嗯，系统已经搭建好了，线焊得没有问题，声音也能放得出来，而且声音相位那些都没有问题。好了，那我们怎么去解决客户提的这两个问题呢？我们一个个来，先把噪音问题解决掉。
Well, the customer response this problem to us. We "Da Da Da Da", quickly ran to the customer there, well, the system has been set up, weld line have no problem, voice has also put out, and the voice of the phase that is no problem. Well, then how to solve our clients this two problem? We all come, first the noise problem.
第一步，先排除外部因素；引起电流声或者噪声问题，外部原因无非，只有三个，外部音源设备、现场坏境噪声过大和系统供电有问题。我们一个个去排除，先把外部音源取下来，再把现场打开的麦克风全部关掉，隔断现场环境噪音的拾取，然后再去确认这一路电源有没有跟其他大型的用电系统共用一路电源。因为如果与其他大型的用电系统共用一路电源，它的使用会大大影响电流的变化，因此产生电流声。
The first step, first remove the external factors; cause the current sound or noise problems, the external reason, only three, there are problems in field environment noise external audio equipment, power supply and system. We all go out, the external audio source to take down, then the site open microphone are switched off, partition pickup field of environmental noise, and then to confirm the power supply has with other large electricity share a system power supply. Because if and other large electricity share a system power supply, its use will greatly influence the current changes, resulting in the current sound.
第二步，逐步排除内部系统各种问题；在这个步骤中，我自己整理了一下自己常用的方法：
The second step, the progressive removal of internal system of various problems; in this step, I organized his commonly used method:
1、最小系统法；我们一套系统中，通常是由前级设备、周边设备、后级组合而成。我们先把周边设备统统去掉，例如：调音台接功放，功放接音箱，看还有没有噪声，如果还有，我们把调音台也舍去了，如果还有，那就是功放本底噪声，属于质量问题，只能换了，因为我们毕竟不是修设备的，呵呵。如果没有，那就是调音台的设置不正确或质量问题，看增益是不是调得过大。
1, the minimum system method; we have a system, usually by the front stage equipment, peripheral equipment, post assembly. We first removed all peripheral equipment such as mixer connected power amplifier, power amplifier is connected to a sound box, to see if there is no noise, if there is, we put the mixer is abandoned, if there is, that is the power amplifier background noise, belong to quality problem, only changed, because we after all not repair equipment, ha ha. If not, it is the mixer settings incorrect or quality problems, see the gain is not transfer too large.
如果最小系统没有问题，那肯定是舍去的那一堆周边出问题了，这时候，我们要把周边的设备一件一件的往上添加，再详细检查是设备设置问题还是质量问题。譬如降噪器有没有调整好、均衡器增益有没有过大等等.......
If the minimum system without problems, it is certainly give a pile of peripheral problems, at this time, we want to peripheral equipment one by one to add, then detailed examination is device settings or quality problems. For example, noise reducer is not adjusted, the equalizer gain is not too large and so on.......
2、替换法；在很多项目中，系统可能不止一个，同样的设备可能会有两台或者以上，我们把检查出来认为有毛病的济南音响 http://www.jnzqyx.com/ 设备换一台其他会议室调试好没问题的设备，同样的设置，如果问题解决了，那就是设备的问题了。如果问题还是存在，那就是系统中还存在其他问题你还没有发现，我们需要重新细心地检查。
2, the replacement method; in many projects, the system may be more than one, the same equipment may have two or more, we have checked out that Ji'nan audio equipment with a replacement other conference room equipment debugging good no problem, the same settings, if the problem is solved, it is equipment the problem. If the problem still exists, other problems that the system you haven't found it yet, we need to carefully check.
3、仪表测量法；通过万用表，电平表等测量仪器，测量音箱阻抗、逐级设备输出电平是否正常。
3, the instrument measuring method; table by million, level meter and other measuring instruments, measuring the speaker impedance, output stage equipment level is normal.
通过以上步骤和方法，我相信很快就把系统中存在的噪声问题解决掉了。
Through the above steps and methods, I believe that soon the noise problems in the system out.
第三步，解决啸叫问题；这个问题的产生是由于扬声器的声音传到麦克风形成了回路，经过多次放大后出现啸叫。最好的办法是将两者之间的通路进行物理上的隔断，比如我们选用麦克风的时候尽量选用指向性的而不选用无指向性的（全向mice）,使用的过程中，麦克风尽量不要正对着扬声器。但是，由于有多支话筒，扬声器的摆放也固定下来了，无法变更，那我们只能借助周边设备去完成这个功能了，例如反馈抑制器，借助smartlive寻找啸叫点，在均衡器上把对应的频率点作衰减。
The third step, solve the howling problem; this problem arises due to the speaker's voice to the microphone forming a loop, after repeated amplification howling. The best way is the path between the two partition physical, such as when we use the microphone to use directional instead of using non directional (range mice), the process of using, as far as possible not to speaker microphone. However, because of a plurality of microphones, loudspeakers placed is fixed, can not change, that we can only use the peripheral equipment to complete the functions, such as the feedback, with the help of smartlive searches howl, the frequency corresponding attenuation on the equalizer.