Since public adress speakers. According to the relevant electroacoustics theory, the sound pressure level SPL in the speaker coverage area has the following relations with the sensitivity level LM of the speaker, the power P fed to the speaker, the listening point and the distance r of the speaker, etc. The sensitivity level of smallpox loudspeaker ranges from 88 to 93 dB, and the rated power is 3 to 10 W. Calculated by 90dB/8W, the sound pressure level at 8m away from the loudspeaker is about 81dB. The contribution of early reflected sound group is not considered in the above calculation. Indoor, the contribution of early reflected sound group and adjacent loudspeakers can increase the sound pressure level by about 2-3 dB.
There are basically no early reflective sound groups in outdoor areas, and the effective coverage of a single public address speaker can only be taken as the lower limit calculated above. Since the lower limit corresponds to a very short distance, in principle, a sound column composed of multiple speakers should be used. The sound pressure level can be increased by 3dB for every doubling of the signal power to the speaker group (such as the sound column) provided that the group is acceptable. From 1 to 2 is double; from 2 to 4 is double. In addition, the sound pressure level will decrease by 6 dB for every doubling of distance. According to the above rules, it is not difficult to calculate the configuration distance of outdoor sound column.
【DSPPA Demo】PAVA8000 EN54 Voice Evacuation SystemNovember 12, 2020Abstract: DSPPA PAVA8000 EN54 Voice Evacuation SystemToday, we are gonna show you a demo about our PAVA8000 EN54 Voice Evacuation System.PAVA8000EN54 Voice Evacuation System can not only support manua...view
The National Standard Approval Meeting held in BeijingJuly 19, 2019The National Standard Approval Meeting held in BeijingThe approval meeting of the National StandardTechnical standard of public address system engineeringis held in Beijing on July 16, 2019. Xue Chang...view
EN
ar
