Ningbo Autrends International Trade Co.,Ltd. , https://www.mosvape.com 1 Sufficient loudness (sound pressure level). In the absence of noise interference, the replay sound heard by the audience should be neither laborious nor deafening. An average sound pressure level of 85 dB is usually required. In view of the undistorted reproduction of the music climax, there is a remaining 10 dB margin, and the digital surround sound system should have a 20-30 dB headroom.
2 Uniform sound field distribution. The sound field is evenly distributed, which ensures uniform distribution of sound energy at all points in the hall, and the loudness heard by the audience in each area is basically the same. Generally, the uniform sound field distribution should ensure that the maximum sound pressure level and the minimum pressure level in the entire hall are not more than 6 dB, and the maximum/minimum sound pressure level and the average sound pressure level are preferably not more than 3 dB.
3 Suitable reverberation time. Reverberation time is an important parameter that affects the sound quality of the theater. Proper reverberation time control can improve speech intelligibility and tone fullness, which can help image positioning while increasing loudness and sound diffusion. For the optimal reverberation time required for the audio-visual room, it can be obtained by the formula T=KV/{S[-2.3lg(1-a)]+4MV} according to its actual volume.
4. Frequency response and effective frequency range. The frequency response is the output sound pressure with frequency variation characteristic when the speaker is at a certain distance from the reference point on the reference axis when the feed speaker voltage (generally 1/10 rated noise power voltage) is constant. It reflects the speaker pair. The radiation capability of sound waves of different frequencies. The frequency response is usually expressed by the speaker output sound pressure level as a function of frequency, called the frequency response curve.
5. The signal to noise ratio should meet the requirements. Indoor environmental noise will interfere and mask the normal hearing, and the noise in the theater should be less than 42dB.
With the guidelines, we can identify the acoustic defects on the site and then take measures to overcome them.