1、合理接地音響設備的外殼一般與設備的電源變壓器屏蔽連在一起，這臺設備外殼也有一個“地”，這個“地”與其他兩個“地”也有所不同。當大地的“地”比較干擾時，設備外殼的“地”與之相接可以降低交流聲干擾，反之則不要相連；
1. The shell of reasonably grounded audio equipment is generally connected with the shield of the power transformer of the equipment. The shell of this equipment also has a "ground", which is also different from the other two "grounds". When the "ground" of the ground is relatively disturbed, the "ground" of the equipment shell can be connected with it to reduce the AC sound interference, otherwise, it shall not be connected;
2、弱信號設備電源與強信號設備電源分組連接弱信號音源設備如CD、卡座、效果器、調音臺、壓縮限幅器和均衡器等同一組電源連接，強信號功率放大器與另一組電源連接，可以避免傳導方式的電源交流噪聲干擾；
2. The power supply of weak signal equipment is connected with the power supply of strong signal equipment in groups. The weak signal sound source equipment such as CD, card holder, effector, mixer, compression limiter and equalizer are connected with one group of power supply, and the strong signal power amplifier is connected with another group of power supply, which can avoid the interference of AC noise of power source in conduction mode;
3、把兩個“地”電位不同的音響設備間的信號地線分離，避免設備直接連通或形成地線環路。如平衡式連接外屏蔽線只在一端接地，或兩端都不接地等；
3. Separate the signal ground wire between two audio equipment with different "ground" potential to avoid direct connection of the equipment or formation of ground wire loop. For example, the external shield wire of balanced connection is only grounded at one end, or both ends are not grounded, etc;
4、連接干凈的電源供電供電電源設計時，應設計單獨電源變壓器；無條件時可使用獨立一組電源供電，與空調、燈光等設備分開供電；或采用隔離電源變壓器等，這些都是行之有效的措施；
4. When connecting clean power supply, separate power transformer shall be designed; When there is no condition, an independent group of power supply can be used to supply power separately from air conditioning, lighting and other equipment; Or use isolation power transformer, these are effective measures;
5、使用懸浮接地就是該點電位與地相同，為零電位。但是該點又不是直接和地相連。是音響設備電路對地電位為零的點。這個“地”與實際的地之間存在阻抗，而且是高阻抗，這樣可以克服共模干擾；
5. The use of suspended grounding means that the potential at this point is the same as that at ground and is zero potential. But the point is not directly connected to the ground. It is the point where the potential to ground of the audio equipment circuit is zero. There is impedance between this "ground" and the actual ground, and it is high impedance, which can overcome the common mode interference;
6、兩音響設備間不能有直流的電路連接；
6. There shall be no DC circuit connection between the two audio equipment;
7、不同系統連接須采用平衡式隔離變壓器連接音響系統與電視轉播車音頻系統的連接；系統與大型電子顯示屏的連接；或與電子計算機的連接等，一般須用平衡式隔離變壓器連接。不同系統共地容易引起交流噪聲的干擾；
7. The balanced isolation transformer shall be used for the connection of different systems to connect the audio system of the sound system and the audio system of the TV broadcasting vehicle; Connection between the system and large electronic display screen; Or connection with electronic computer, etc. generally, it must be connected with balanced isolation transformer. The common ground of different systems is most likely to cause the interference of AC noise;
8、遠距離傳送信號使用平衡式或平衡隔離變壓器的傳輸方式，短距離可以用不平衡式。采用平衡隔離變壓器的傳輸方式一般兩端都要有平衡變壓器，屏蔽層一端接地，也可懸空不接。接地可以起到屏蔽作用，也可防止設備漏電發生觸電事故。不接地時，兩端平衡變壓器可起到絕緣隔離作用，平衡變壓器中心接地，可泄放靜電；
8. The transmission mode of balanced or balanced isolation transformer is used for long-distance signal transmission, and unbalanced type can be used for short-distance signal transmission. The transmission mode of balanced isolation transformer is adopted. Generally, there should be balanced transformer at both ends, and one end of the shielding layer can be grounded or suspended. Grounding can play a shielding role and prevent electric shock accidents due to equipment leakage. When not grounded, the balance transformers at both ends can play the role of insulation and isolation, and the center of the balance transformer is grounded to discharge static electricity;
9、在電源干擾很嚴重的情況下，設備分相連接把小信號的音響設備和監聽設備電源連在一起，選擇三相電源中交流聲干擾小的一相接入，其余兩相接大信號功率放大器，可以降低來自電源的交流噪聲干擾；
9. When the power interference is very serious, the equipment is connected in separate phases to connect the power supply of small signal audio equipment and monitoring equipment. Select the phase with the smallest AC acoustic interference in the three-phase power supply, and the other two phases are connected with large signal power amplifier, which can reduce the AC noise interference from the power supply;
10、檢查一下是不是你的電網電源不干凈；
10. Check whether your power grid is not clean;
11、是不是某些設備接地問題；
11. Whether there is grounding problem of some equipment;
12、再者就是看看設備連線間又沒有干擾（弄的很亂/接口有沒有虛焊）；
12. In addition, there is no interference between the equipment connections (it is very messy / whether the interface is welded);
13、看一下是否受燈光（硅箱、信號線）的干擾：
13. Check whether it is disturbed by light (silicon box, signal line):
14、通常音響有交流聲比較響的話是功放的問題，功放信噪比做的不是很好的話就會發出很響嗞嗞聲。先查查是否是信號線的問題，只要把所有信號線拔掉再打開功放，如果喇叭里沒有很響的交流聲那就是信號線的問題了，先看看插頭是否有短路碰線現象（拿萬用表測比較準），有的話就重新焊接插頭了就可以了。如果這樣也不行的話那就只有重新換信號線了。拔掉信號線仍舊有很響的交流聲那就是功放的問題了，說明功放比較差，要解決這個問題就只有換臺好的功放了。
14. Usually, if the audio has a loud communication sound, it is the problem of the power amplifier. If the signal-to-noise ratio of the power amplifier is not very good, it will make a very loud sound. First check whether it is the problem of the signal line. Just unplug all the signal lines and then turn on the power amplifier. If there is no loud AC sound in the horn, it is the problem of the signal line. First check whether the plug has a short circuit and touches the line (it is more accurate to measure with a multimeter), and if so, re weld the plug. If that doesn't work, you have to change the signal line again. There is still a loud communication sound when you unplug the signal line, which is the problem of the power amplifier. It shows that the power amplifier is relatively poor. To solve this problem, you have to change a good power amplifier.
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