1: First of all, consider the covering angle of the speaker, and whether the location points of the speaker can cover the area that must be covered. 2: Calculate the attenuation coefficient of noise coefficient. Use the constant larger noise coefficient of speakers to calculate the larger noise coefficient when the sound reaches the human ear, and see if it can take into account the first-level regulation of the General Assembly of China (98dB). 3: Handle the problem of speaker vibration. The vibration is related to the production and manufacture of the speaker itself. At this stage, some speakers can ensure the vibration resistance and can mainly express the sound very well. It is proposed to replace the loudspeaker
According to the application regulations, different loudspeakers have different application sites.
4: To deal with the problem of acoustic structural column, the sound coming out of the ceiling speaker is really from the head, which will make people feel like the structural column. The comfort is different for different people. There is no doubt that the audio staff of the technical profession can be different, and the average person is likely to feel indifferent. The processing method can apply the wall-mounted main loudspeakers to integrate the ceiling speakers. The sound image is pulled according to the main loudspeakers, and the ceiling speakers play an auxiliary sound supplement. If the standard is better, it can be proposed to consider the wall-mounted loudspeakers. When reporting work, the wall-mounted loudspeaker system software is required, and the ceiling speakers are usually used as the music background. 5: For the power problem, we usually use 1.3-1.5 times of the rated power (rms) to set it, and some use the power of the variety show to equip the power amplifier (PGM). The key consideration is that the base power on the power amplifier can not be used 100%, and the second is that the power slightly exceeds the speaker power, which will make the sound played more powerful and more pleasant (be careful to operate, because the power is too high to burn the speaker). Generally, there are two types of ceiling sound: fixed pressure and fixed resistance. The difference between constant resistance and constant pressure of ceiling mounted audio has the following three aspects:
1. Output mode difference:
① The constant voltage is not the fixed working voltage, but the output mode is the constant voltage, which specifies the rated current of the load. The constant-voltage power amplifier is connected in series with several constant-voltage audio systems. If the total power does not exceed the total power of the constant-voltage power amplifier.
② The output and input resistance of the fixed resistance power amplifier is specified to be certain. In the fixed resistance power amplifier, if the load characteristic impedance changes, the power will change relatively. The fixed resistance power amplifier with 8 ohm bus and 100W becomes close to 200W when connected to 4 ohm bus.
2. The use of the site is different:
① The constant-voltage power amplifier is mainly used in the public address system in public places. Because the distance between the public address speaker and the power amplifier is relatively long, and a power amplifier is usually connected with several low-power audio.
In order to better reduce the line consumption and prevent the sound of other speakers from being harmed when one speaker is turned on or off in the system software, the constant voltage power amplifier outputs high voltage and low power flow [relative]. The constant voltage connection power amplifier has several sound systems. If the sound system is connected in series with a common cable line, it is OK.
② Fixed resistance power amplifier. It is mainly used for home music background, home theater set, KTV, and performance stage. Because the distance between home music background, home theater set, and performance stage is relatively close to the power amplifier and there is no need to connect a lot of sound, the fixed resistance power amplifier has high power flow and low voltage output. The connection between the power amplifier and the speaker should use a special speaker cable.
