Hainan Broadcasting System, Haikou, Sanya, Qionghai, Wenchang background music system installation, voice steady ..

Hainan Broadcasting System, Haikou, Sanya, Qionghai, Wenchang background music system installation, stable and clear voice to undertake various cities and counties in Hainan public broadcasting systems engineering, to provide quality products and after-sales maintenance free for life. Should be chosen depending on the environment of different varieties and specifications of the radio speaker configuration guidelines and principles on the selection of the radio speaker. For example, in the ceiling of the interior ceiling, it is appropriate embedded without the rear cover of the ceiling speakers. Such speakers simple structure, relatively cheap, and easy construction. The main disadvantage is that there is no rear cover, easily insects, rodents bite. In just a frame ceiling without ceiling indoors (such as shopping malls open frame), it is appropriate ceiling-mounted tube-type speakers or ceiling speaker rear cover. Due to a ceiling equivalent to infinite baffle, so conditions under ceiling speakers without a rear cover does not cause acoustic short circuit. The situation is quite different when there is no ceiling if still with no rear cover ceiling speaker, the effect will be poor. At this principle should be used lifting speakers. However, if too large investment, it can also be a rear cover ceiling speakers. There ceiling speaker rear cover rear cover not only the general mechanical protective effect, but also serve to prevent short-circuiting of the sound effect to some extent. No ceiling in the room (such as an underground parking lot), are advised to use a wall-mounted speakers or indoor frets. Outdoors, should use outdoor frets or horn. Such frets and horn function not only rain, but also the larger the volume. Because open outdoor environment, no reverb effect, choose a larger volume variety is a must. In the garden, meadow, lawn speaker should be chosen. Such speakers rain, sleek, and the volume and sound quality are more particular. In the decoration stress, high ceiling wide hall, should use elegant, harmonious shades ceiling-mounted speakers. In case a higher fire safety requirements, should use fire-speakers. Such speakers are sealed type, its outlet port capable of mating with a fire-retardant casing. Radio speaker radio speaker configuration in principle uniformly dispersed in principle arrayed to the broadcast service area. Its degree of dispersion of the signal to noise ratio should ensure the service area is not less than 15dB. Typically, the noise floor office buildings corridor is about 48 ~ 52dB, the noise floor supermarket about 58 ~ 63dB, the noise floor of the downtown section of about 70 ~ 75dB. Consider the case of an accident, the scene can be very confusing, so in order to require emergency broadcast, even if broadcast service area is the office, nor should the background noise estimate is too low. He noted that, as a general consideration, in addition to the bustling place, might roughly the background noise as (except for special circumstances) 65 ~ 70dB. The same projections, SPL broadcast coverage area should be in 80 ~ 85dB or more. In view of the radio speakers are usually scattered distribution, so the sound pressure level broadcast coverage area can be approximated that the contribution of individual radio speaker. SPL levels according to the sensitivity level LM theory of electro-acoustics, the speaker with the speaker of the coverage area, the electric power is fed to the speaker P, listening point and the speakers of the distance r and so have the following relationship: Ceiling speaker sensitivity level in 88 between ~ 93dB; rated at 3 ~ 10W. With 90dB / 8W calculations, 8m away from the speaker of the sound pressure level of about 81dB. The contribution of early reflections above calculations did not consider the group. Contribution in the room, early reflected sound group and the sound pressure level near the speaker can increase about 2 ~ 3dB. Based on the above approximate calculation, the ceiling is not higher than 3m venues, the ceiling loudspeaker can be roughly uniform distance from each other 5 ~ 8m configuration. If we consider only the background music regardless of the emergency broadcast, the distance can be increased to 8 ~ 12m. In addition, suitable for Chinese mainland fire radio design and installation specifications (hereinafter referred to as "Code") have the following mandatory: "aisle, lobby, restaurants and other public places, configure the number of speakers, should guarantee from any part of the floor to Recently a walking distance from the speakers does not exceed 15m. In the aisle crossing, turn the speakers should be located. aisle end of the last one speaker from the wall no more than 8m ". Outdoor places virtually no early reflections group, effective coverage of a single radio speaker can only take lower calculations above. As the lower limit corresponding to the distance is very short, so you should use the frets of a plurality of loudspeakers in principle. Fed to the speaker group (eg fret) signal electric power per doubling (provided that the group can accept), the sound pressure level can improve 3dB. Please note that \ "; doubled \"; meaning. Tel: 18889798499 Miss Wen is doubled by the 1 to $ 2; and consists of 2 to 4 is to be doubled. In addition, each doubling the distance, the sound pressure level will decrease 6dB. Configuration is easy to calculate the distance of the outdoor frets under such rules. For example, CE-704 outdoor frets for example, the rated power of 40W, is more than four times the individual ceiling speakers. Therefore, the effective coverage distance is more than 2 times the individual ceiling speakers. In fact, this distance can also be larger. Because of the sensitivity of frets higher than a single ceiling speaker (about high 3 ~ 6dB), and each additional 6dB, the distance can be doubled again. That is the distance covered frets CE-704 can reach more than 20m. But fret relatively narrow angle of radiation, which is only valid in front of about 60 to 90 degrees (horizontal) or so. Liansheng above are Hainan Science and Technology Development Co., Ltd. to provide you with professional public broadcasting system introduction, such as the need for more information waiting for you to inquire! (Aftermarket enjoy free lifetime service) The Company has a strong and experienced construction team, trust, reliable, professional, attentive service to us! Tel: 18889798499 Miss Swan Company Address: Room pretty good Hainan Haikou Meilan District Building, 707 diligent way