Sound engineering installation design _ Wuhan Jiuhua video (certified) _ Audio Video provided by Wuhan Engineering Co., Ltd. Jiuhua. Jiuhua Video Engineering Co., Ltd., Wuhan (www.jowa-tech.com) is specialized in the "network products, multimedia products, audio equipment, smart home product design and installation," the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Lo. Technical requirements for room sound reinforcement system: ① average SPL SPL indoor sound reinforcement system is about 68--74dB; average sound pressure level music sound system about 68--74dB; ballroom music sound The average sound pressure system can also be further increased 5--10dB. Indoor sound field inhomogeneity is about ± 3dB. ② indoor SNR allowable noise are shown in Table, the minimum sound pressure level in the interior position, the SNR should be greater than 30 dB. Indoor allowable noise level allowable noise level DBA NR places cinemas, conference rooms 35--40 30 ③ maximum distance indoor sound reverberation sound field helps to reduce the sound field inhomogeneity sound engineering installation design, but too much will reduce the reverberant sound clarity. Therefore, in the auditorium acoustics design seeks to increase the useful part of the reverberant sound energy. Interior design in sound reinforcement, if the provisions of the acoustic speaker axial projection farthest point is not less than 1/4 that of the direct sound intensity of not less than 12 dB lighting and sound mixing sound and strong construction, the distance of the audience seats speaker should not exceed 4 times the critical distance. Resolution demanding the classroom, the maximum distance can be selected for three times the critical distance. ④ stability indoor sound reinforcement system should sound and stable work, and to ensure that the two types of distortion caused by acoustic feedback is smaller. Although the interior design seeks to improve the janitor sound amplification gain, but taking into account the impact of some factors of instability, we must ensure the stability of 9 dB. ⑤ heard of the condition of the interior natural sound reinforcement system should ensure that the transmission frequency response: 125--4000HZ, ups and downs for 6--10 dB; 100--8000HZ, ups and downs for 10--15 dB, using frequency can not be satisfied balanced approach to improve the sound. Sound reinforcement system equipment installation layout principles ☆ uniform sound field so Auditorium; ☆ audiovisual same direction stage lighting and sound engineering solutions, sound cordial nature; ☆ overcome favorable feedback to improve the audio gain; the line is simple, easy to repair, adjust coverage angle;