Many large modern style buildings, such as railway stations,

 airports, religious places and convention centers, will use hard structural materials on the ground, walls and ceiling. Due to the site volume and the sound absorption coefficient of building materials, there will be a lot of reflected sound and reverberation time in the site. This will have a great impact on language clarity. However, whether it's the airport gate change broadcast or the prayer in the chapel, it's very important to be heard clearly. The variable directivity speaker array from Bosch will overcome this challenge and provide unparalleled acoustic performance in harsh environments. System overview notes unless otherwise indicated, where var ﹣ B, VAR ﹣ BH or var ﹣ e are mentioned in this data sheet, the information provided is also valid for white style vari ﹣ BL, VAR ﹣ BHL or vari ﹣ el. Bosch variable directional loudspeaker is a comprehensive solution to deliver clear information to people in large reverberation area. This series of products integrates digital signal processing and high efficiency class D power amplifier in active array loudspeaker unit. Using software, the sound beam of loudspeaker array can be adjusted so that it only covers the audience area, which greatly improves the signal-to-noise ratio of the system and ensures perfect speech clarity. The modular design can form three different length arrays to meet the requirements of different sizes of sites. The use of separate array components makes shipping easier and the array can be upgraded to longer arrays. The optional CobraNet module allows the array to be networked so that the array can receive digital audio data through CobraNet and monitor the working status of the speakers. These devices are suitable for background music and voice. Although these speaker arrays are very complex and can still provide unparalleled sound in harsh acoustic environments, advanced configuration software makes the setup very convenient. Units currently available with gray aluminum ral 9007 or signal white ral 9003 coatings are available. Basic function advanced beam control Bosch variable directivity array provides excellent direct to reverberation sound ratio. First, it projects more direct sound energy into the audience area, while reducing the reflected energy from the ceiling. Because the attenuation rate of the sound energy of the line source with distance is much less than that of the point source, the direct sound can be stronger in the same area. Unlike the traditional mechanical control of the voice column to change the projection direction, Bosch variable directivity loudspeaker uses electronic control to change the beam direction. This technique changes the direction of the beam by setting a different delay for each cell in the array. So now array speakers can be installed vertically on the wall or even embedded. This not only has a beautiful appearance, but also helps to reduce the interference generated by the energy behind the speaker after the wall reflection. In addition, the advanced electronic beam control technology of Bosch variable directivity loudspeaker can also control the beam shape to ensure that every position in the listening area can get balanced and clear effect. Only in this way can the audience hear a balanced voice. Another important factor is the sound pressure level of the signal. Usually we want the loudness of all listening positions to be consistent to avoid hot spots. In order to create a uniform sound level in a large area, the beam shape needs to be optimized for the listening plane (ear height). In order to solve this problem, it is necessary to accurately control each frequency of each loudspeaker. Bosch variable directional loudspeaker can adjust frequency response and time delay through built-in digital signal processing and multi-channel power amplifier. Thus, the uniform sound pressure level can be obtained in the coverage range of the loudspeaker, and the lobe interference effect is reduced to the minimum. In addition, Bosch has variable directivity

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