The sound system with fixed installation of pipeline design generally needs to send signals from stage microphones and electronic instruments to the sound control room through cables, and also send power amplifier output cables to the speaker system. These cables should be laid through pipes.

1) What needs to be explained here is the problem of threading and laying the microphone input line and speaker output line outside the control room. Although signal wires used in electroacoustic engineering use metal braided shielding wires, it is best to use iron pipes for installation of fixed equipment, whether it is laid in concealed or exposed conduits.

(1) The benefits of wearing iron pipes

① The cable is protected by iron pipes to prevent damage.

② Prevent interference from spatial electromagnetic fields and have good shielding effect.

③ The piping engineering can be done in advance, and the final threading is very convenient, and it is also easy to replace the wire group. In newly built and renovated halls, pipeline design is also crucial to ensure undistorted signal transmission.

(2) The key points of pipeline design are to reduce induced noise during transmission, and the input line of the microphone often adopts a dual core shielded wire, which must be threaded into a metal tube. Special attention should be paid to keeping the wiring away from power transmission cables and avoiding parallel wiring. At the same time, the connection between the pipe joint and the wiring junction box should be handled properly. The location of the microphone is always subject to change, and when designing, it should be noted that