It should be closely cooperated with architectural acoustic design, architectural design and other related engineering design majors, and use the position of the speaker system as the main sound source point to solve the problems of noise time and reflection distribution one by one.

The GB/T 14197 of the National Standard "Sound System Equipment Interconnection Election Value" should be met. The interface shall meet the requirements of GY/T 187, "Multi -Pass Audio End Serial Interface" in relevant national industry standards.

A complete drawing and explanation file should be provided. Including pipe maps, design layout diagrams, system principles and configuration and wiring diagrams.

The sound expansion system should not cause environmental noise pollution to people outside the service area.

The number of speakers should be sufficient and can meet the pickups of different types of sound source. In addition, if a wired device is used, the signal wiring should use a shielded balanced cable.

The speaker system must have reliable security measures. If it involves changes in the bearing structure, the design unit with the corresponding qualifications must be re -verified to the safety of existing architectural structures.

The connection power loss between the power amplifier and the main speaker system should be less than 10%of the power of the main speaker system, and the connection power loss of the low -frequency speaker system should be less than 5%.