(1) Working grounding, also known as system grounding, is to ensure the normal operation of the system, prevent system oscillation, and ensure the reliability of equipment in the system. It is usually necessary to install grounding at the appropriate location for the operation of multi-functional audio equipment units. As a normal 220V power supply, the ground wire is the neutral point of the transformer. Sound reinforcement system

(2) To obtain a stable reference potential, a logic grounding, also known as a DC neutral point, is set.

(3) Shielded grounding is installed to prevent the impact of electromagnetic induction on the system. It is a complex grounding system for all grounding systems, as it can prevent other people from interfering with each other at the same time. The higher the interference frequency, the denser the metal mesh used for shielding, otherwise the effect cannot be achieved.

(4) Install signal grounding to ensure stable reference potential, i.e. the reference object mentioned above.

In the sound reinforcement system of multifunctional audio equipment, logic grounding, signal grounding, and shielding grounding are organically combined through the grounding terminal of the signal line, so that the system equipment operates at a unified potential. It should be emphasized that the signal input and output terminals of the same device should not be connected together. The output of the pre I level can only be connected to the input of the post I level, otherwise the signal may float through ground feedback. Of course, completely eliminating noise is very difficult. We can only control or reduce the voltage of noise as much as possible, improve the signal-to-noise ratio of the system, and prevent noise from forming interference.