Solution to alternating sound during installation and connection of KTV audio equipment

　　1. The enclosure of the reasonably grounded audio equipment is usually connected with the shield of the power transformer of the equipment. The enclosure of this equipment also has a "ground", which is different from the other two "grounds". When the "ground" of the ground is disturbed, the "ground" of the equipment shell connected to it can reduce the noise disturbance, otherwise, it should not be connected.

　　2. In case of serious power supply disturbance, the equipment shall be connected by phases to connect the small signal audio equipment and the monitoring equipment power supply together. The phase with the least communication noise disturbance among the three-phase power supply shall be selected for connection, and the other two phases shall be connected to the large signal power amplifier to reduce the communication noise disturbance from the power supply.

　　3. There shall be no DC circuit connection between the two audio equipment.

　　4. The transmission method of balanced or balanced barrier transformer is used for long-distance transmission signal, and the unbalanced type can be used for short distance transmission. The transmission method using balanced barrier transformer usually requires a balanced transformer at both ends. One end of the shielding layer is grounded, or it can be suspended in the air. Grounding can play a shielding effect, and also can prevent electric shock caused by equipment leakage. When it is not grounded, the two balance transformers can act as insulation barrier, and the balance transformer base is grounded to discharge static electricity.

　　5. The power supply of weak signal equipment and the power supply of strong signal equipment are connected in groups. Weak signal sound source equipment such as CD, card holder, effector, mixer, compression limiter and equalizer are connected with one group of power supplies. The strong signal power amplifier is connected with another group of power supplies, which can prevent the power source communication noise disturbance of the conduction method.

　　6. The application of suspension grounding means that the potential of this point is the same as that of the ground, which is zero potential. But this point is not directly connected with the ground. It is the point where the potential of audio equipment circuit to ground is zero. There is an impedance between the "ground" and the actual ground, and it is high impedance, so common mode disturbance can be overcome.

　　7. The connection of different systems must adopt the balanced barrier transformer to connect the audio system with the audio system of the TV relay vehicle; Connection between the system and large electronic display screen; Or the connection with the electronic computer, etc., usually must be connected with a balanced barrier transformer. Different systems are the simplest to cause disturbance of communication noise.

　　8. Separate the signal ground wires between two audio equipment with different "ground" potentials to prevent the equipment from being directly connected or forming a ground loop. For example, the balanced connecting external shield wire is grounded at one end only, or both ends are not grounded.

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