1、 The design basis of the sound system is that the hall sound is mainly natural sound, requiring good diffusion, uniform sound field distribution, appropriate loudness, and good naturalness. After the hall is built, a reasonable sound system needs to be installed. The purpose of adopting a sound system is to improve the loudness and uniformity of sound field distribution, improve the sound quality of the hall, and enhance the sound effect.

1. The conditions for designing a sound reinforcement system In order to achieve good sound quality, it is necessary to meet some necessary conditions, which are the basic requirements for designing the acoustic indicators of the entire sound system.

1) Halls and rooms that require low background noise for sound reinforcement must have low background noise. The noise may come from outdoors or indoors, such as the noise generated by air conditioning, ventilation equipment, and light equipment during movement. Measures should be taken to minimize the noise in the listening environment as much as possible. Excessive noise can cause a decrease in the intelligibility of the electrical sound reinforcement system, making it difficult for the audio system to achieve the desired sound quality. However, increasing the output sound pressure level may lead to sound feedback and make the system unable to work stably. The issue of indoor noise control must be fully considered during construction and decoration, and necessary sound insulation measures must be taken. The background noise of general cinemas is 25-30Db, the lecture hall is 30-35dB, and the gymnasium is 47-56dB.

2) It should have a uniform and reasonable sound pressure level. The indoor sound pressure level should reach a certain value according to different types of sound reinforcement. Specifically, music amplification should reach an average sound pressure level of 80-85Db, speech amplification should be 70-75dB, and background music should be 60-70dB, with unevenness controlled within ± 4dB. This requires that the electric sound reinforcement system should have sufficient output power and sound gain, the indoor sound field should be evenly diffused, the near reflection sound shadow should be fully and reasonably utilized, and the radiation characteristics and placement position of the speaker should be reasonably selected.

3) The sound reinforcement system should ensure the intelligibility of the language. This requirement is particularly important in situations where language reinforcement is used, and it is generally believed that the maximum allowable consonant loss rate should not exceed 15%. For halls that mainly focus on music playback or sound reinforcement, this indicator can be appropriately relaxed, but better sound effects are required.