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Choosing the appropriate sound device is crucial for the propagation effect in different usage scenarios. Therefore, it is recommended to use different sound devices in different situations. So, in what situations should a megaphone be used and a speaker horn be used? For close range communication occasions, such as organizing gatherings or lectures, it is recommended to use a megaphone, which can effectively enhance the speaker's voice and make the surrounding audience better feel the content of their speech. For long-distance communication situations, such as outdoor competitions, emergency rescue, etc., it is recommended to use a horn speaker to send a larger sound, improve personnel communication, and convey instructions effectively. Overall, in practical use, both the megaphone and the horn loudspeaker have their own characteristics and different applicable scenarios. Given the importance of acoustic devices, it is recommended to fully consider all factors before purchasing to ensure the most suitable usage effect.

A speaker horn is a multi throat sound device, usually composed of multiple throat tubes connected in series, in a conical shape. Compared to other types of PA loudspeaker, horn speakers have a higher volume and better performance over long distances. When in use, it is necessary to use an air or power source to amplify the sound through a throat and achieve propagation. A megaphone, on the other hand, is a trumpet shaped, open shaped device commonly used for close range propagation. The characteristics of magaphones are simple and easy to manufacture, small in size, light in weight, portable, and more convenient to use. When in use, there is no need for an external power or air source, but the sound is amplified through its own resonance effect.

Megaphones are suitable for close range communication, such as in competitions, speeches, or gatherings, to enhance the speaker's voice and enable a larger audience to hear the content. The horn speaker, on the other hand, is suitable for long-distance transmission, such as in sports venues or outdoor rescue situations, where it needs to emit significant noise to expand the range of sound transmission. Finally, the usage of the two is also different. Due to the fact that Megaphones amplify sound through the resonance effect of their own throat, users need to use their palms and other parts to change the speed of air flow, thereby altering the adjustment of the resonance effect. The speaker horn, on the other hand, requires the user to use an external air or power source to drive the sound. Typically, the user will be equipped with a Bluetooth microphone or collector for sound input and output.

A speaker horn is a multi throat sound device, usually composed of multiple throat tubes connected in series, in a conical shape. Compared to other types of PA loudspeaker, horn speakers have a higher volume and better performance over long distances. When in use, it is necessary to use an air or power source to amplify the sound through a throat and achieve propagation.

As a professional sound equipment manufacturer, Taixing Minsheng Electronics Co., Ltd. has always been committed to providing users with high-quality and cost-effective sound products. After years of hard work, our siren horn speakers have gained popularity in both domestic and international markets. Our high-power civil air defense speaker horn has the characteristics of strong sound direction, long-distance transmission, and extremely high speaker power, making it a powerful sound device. These civil air defense horns are produced in Taixing, Jiangsu, located in the Yangtze River Delta region, downstream of the Yangtze River, bordering the Yellow Sea to the east, Zhejiang and Shanghai to the southeast, Anhui to the west, and Shandong to the north. Our high-power civil defense horn has guaranteed quality. Each ultra long range high-power horn loudspeaker has undergone multiple tests and improvements, ultimately producing a unique sound effect. It has characteristics such as high sound quality, high clarity, and high reliability, which can meet the needs of different occasions. The sound output power of the speaker ranges from several hundred watts to several kilowatts, with excellent long-distance transmission and directional effects. It can transmit sound to hundreds or even thousands of meters away, and is widely used in various fields such as civil defense, security, transportation, and tourism. If you need a high-performance and high-power speaker device, come to our company for consultation.

After years of practice, it has been concluded that when installing alarm speaker, it is necessary to confirm that the winding of the motor meets the requirements according to corresponding standards to ensure that its insulation resistance meets safety standards. Due to the need for short circuit protection in the power supply, the current should be ensured to be less than 7 times the fixed multiple of the rated current and greater than 5 times. The support of the alarm equipment should meet safety requirements and undergo rust prevention treatment. The siren speaker horn needs to be installed and debugged to confirm that the bottom welding is firm. It is necessary to note that the connection wires between the power supply and the motor are firm and reliable, and the grounding device is installed firmly. The nuts of the junction box of the power supply machine need to be installed tightly to ensure that the junction box cover is sealed tightly. The power cord needs to be fixed with cables or steel wires outdoors, and fixed with wire clamps indoors. At the same time, it is necessary to ensure that appropriate waterproof and lightning protection loudspeaker hron is equipped.

The first specification of a power amplifier is its maximum power. This parameter specifies the peak power that the PA amplifier can provide to the specified load at a specified output level and in a short period of time. Therefore, it defines the absolute maximum capacity for this specific design. However, it does not tell you how much average power an Electronic amplifier can handle without overheating or other power issues. Another rated power of a power amplifier is the output power, sometimes referred to as RMS power (root mean square). The output power should be considered as the power that the amplifier can provide continuously for a long time without overheating or power interruption. Therefore, when comparing two different power amplifiers, the difference between these two rated powers should also be considered.

Firstly, ensure that the selected layout building height is appropriate. Secondly, the selected placement position can be properly managed. Thirdly, the overall layout of the speaker horn installation position is reasonable. Fourthly, if the selected location is an independent space, the space size cannot be less than 10 square meters. Fifthly, the installation of the alarm horn speaker requires attention to the power supply configuration and reinforcement of the installed basic components. The site selection for installing siren horn loudspeaker needs to be based on planning. When installing alarm horns and determining the coverage range of the sound system, special attention should be paid to the matching relationship between the installation area and the electric motor.

According to the place of use and the requirements for sound, the speaker horn should be selected in combination with the characteristics of the speaker. For example, for outdoor voice-based broadcasting, electric Speakers Horns can be used. If higher sound quality is required, electric speaker boxes or sound columns should be used: for indoor general broadcasting, small Horn Speakers made of a single electric paper cone speaker can be selected. : For listening to music or for high-quality PA loudspeaker amplification, a speaker box composed of high and woofer speakers should be used. The following points should be noted when using the speakers: (1) The power received by the speaker should not exceed its rated power, otherwise, the voice coil will be burned, or the voice coil will be scattered. The working voltage of electromagnetic and piezoelectric ceramic speakers should not exceed 30V. (2) Note that the impedance of the speaker should be matched with the output line. For details, please refer to the section on amplifiers. (3) To correctly select the model of the speaker. If it is used in the square, the tweeter should be used; if used indoors, the paper cone type speaker should be used, and the auxiliary sound box should be selected. The high and low speakers can also be made into speaker groups to extend the frequency response range. (4) When arranging the speakers, it is necessary to achieve a uniform and sufficient sound level. If a single (point) speaker cannot meet the needs, multiple points can be set, so that each listener can get almost the same sound loudness, improve the The clarity of the sound; a good sense of orientation, the speaker should be installed more than 3 meters above the ground, so that the audience can "see" the speaker, and try to make the horizontal hearing (sound source)-visual (speaker) as far as possible Consistent, and the distance between the two speakers should not be too large. (5) Electric horn-type speakers must be put on the horn before they can be used, otherwise it is easy to damage the sound head. (6) When two or more speakers are used together, attention must be paid to the phase problem. If it is reversed, the sound will be significantly attenuated. The easiest way to measure the phase of the speaker is to use the high-sensitivity meter head or the 50~250μA current block of the multimeter, connect the test meter to the wiring head of the speaker, hold the paper cone with both hands, and push it hard. direction to determine their phase. If the phases are the same, the hands swing in one direction. At this time, the voice coil lead connected to the positive test pen can be regarded as the "ten" level.

Air defense warning equipment is generally installed and installed by civil defense departments on the roofs of buildings in cities, and is managed by relevant street communities, enterprises and institutions. The state guarantees the smooth communication and warning of civil air defense, in order to quickly and accurately transmit and issue air defense warning signals, and effectively organize and command civil air defense. The competent departments for civil air defense of local people's governments at or above the county level are responsible for formulating plans for the construction of civil air defense communication and alarm networks in their respective administrative regions, and organizing the construction and management of civil air defense communication and alarm networks in their respective administrative regions. The installation of civil air defense communication and warning facilities shall be facilitated by relevant units or individuals and shall not be obstructed. The civil air defense warning facilities set up in relevant units shall be maintained and managed by their respective units and shall not be dismantled without authorization. The installation of air defense alarm horn speaker equipment is closely related to the construction of civil air defense networks, and there are specific requirements for the installation and location of alarm facilities. Scientific location selection can not only improve alarm coverage, but also reflect the role and status of air defense alarm horn speakers in the combination of peacetime and wartime. Civil air defense departments should follow the requirements of air defense warning deployment planning and Responsible for selecting appropriate alarm equipment and installation locations to ensure the coverage effect of the air defense alarm network, based on the actual situation of the alarm trial. The selection of air defense alarm address should pay attention to the following points: Firstly, the height of the selected layout building should be ensured to be appropriate. Secondly, the selected placement location can be properly managed. Thirdly, the overall layout of the location is reasonable. Fourthly, if the selected location is an independent room, the room size cannot be less than 10 square meters. Fifthly, the installation of equipment requires attention to the configuration of the power supply and reinforcement of the installed basic components. The location selection of installation equipment needs to be based on planning. When installing alarm horn loudspeaker and determining the coverage range of sound, special attention should be paid to the matching relationship between the installation area and the motor.

1. Site selection Site selection is the first and crucial step in the debugging of outdoor audio systems. When selecting a location, the following factors should be considered: (1) Environmental noise: Stay away from high noise areas such as roads, construction sites, airports, etc. to avoid affecting sound quality. (2) Wind direction and speed: Avoid facing the direction of strong winds to prevent damage to the speaker. At the same time, excessive wind speed can affect the stability of the audio system, so sunshades or umbrellas should be set up in appropriate locations to reduce the impact of wind on the audio system. (3) Terrain and terrain: Choosing a location with higher terrain is beneficial for the transmission and echo of sound. At the same time, the ground should be as flat as possible to reduce the interference of vibration on the audio system. 2. Layout After the site selection is completed, the layout of the sound system should be based on the size and shape of the selected site. Generally speaking, the layout of the sound system should follow the following principles: (1) Main horn loudspeaker: The main PA Loudspeaker should be placed in the center/central position of the venue, approximately 10-15 meters away from the audience, to ensure uniform distribution of sound. At the same time, the height of the main speaker horn should be equivalent to the height of the audience's eyes, in order to observe the working status of the audio system. (2) Sub horn speakers: The sub speakers should be placed on both sides of the main speaker, approximately 6-8 meters away from the main speaker, to create a stereo effect. At the same time, the height of the subwoofer should also be equivalent to the height of the audience's eyes. (3) Line array speakers: Line array speakers are suitable for large outdoor activity venues, such as stadiums, concerts, etc. The line array speaker can be arranged horizontally and vertically as needed to cover a larger range. When placing wire array speakers, attention should be paid to maintaining a certain spacing to avoid mutual interference.

Waterproof alarm horn speakers have many applications, especially for those who need to be outdoors, exposed to rain, or water. Therefore, waterproof alarm horn speaker should be chosen. What are the applications of waterproof alarm horns? Below are simple examples to introduce. Waterproof alarm horn loudspeaker is widely used in automobiles, whether it is for household cars, buses, buses, fire trucks, police cars, or other vehicles. Waterproof alarm horns are chosen because vehicles often drive on rainy days. If it were not for the waterproof alarm horn, the horn would definitely not sound when water enters, and at this point, it would not have the function of warning. So it is still necessary to use waterproof alarm speakers on vehicles, but nowadays, most speakers are still waterproof. Of course, unnecessary ones such as speakers and TV speakers can be used without waterproofing.

Transmitting audio signals, that is to say, when the audio signal passes through the speaker diaphragm voice coil, the coil will generate a magnetic field, which interacts with the magnet on the speaker to generate vibration and restore the sound. The Replacement Diaphragm voice coil is the heart of a PA Loudspeaker, usually made of copper enameled wire wrapped around a basin frame. The quality of a voice coil depends on whether it can withstand high temperatures and whether it has strong adhesion. The voice coil is a key device for converting electrical energy into sound in a speaker. The electrical energy input into the voice coil is converted into mechanical energy to drive the vibration plate to produce sound. The voice coil is made by winding enameled wire on the core cylinder using a winding machine. The parameters and quality of the voice coil winding have a significant impact on the rated power rating characteristics, total harmonic distortion, and service life of the horn. The enameled wire used for winding voice coils can be divided into copper aluminum wire and copper clad aluminum wire according to the material. Copper wire is easy to solder and is widely used in high-performance speakers. In order to improve the performance of the speaker, increase its analytical power, and improve its damping, it is necessary to use oxygen free copper wire with a purity of 5N9 or above. Aluminum wire has the advantages of light weight and high efficiency, which can improve the high pitch and sensitivity of the speaker. It also has short boards that are not easy to process and weld. Therefore, it should only be used when there are special requirements. Copper clad aluminum wire is a combination of both advantages. Although the welding quality is light, the price is high, so it can only be used in situations with high requirements. There are two common faults: 1. Contact ablation: If the micro horn is pressed for a long time, it is easy to cause the horn contact to burn and generate impedance. The current flowing through the electromagnetic coil weakens, the electromagnetic attraction decreases, and it cannot attract the armature to drive the diaphragm to vibrate normally, resulting in hoarse or even no sound. There is also an example where when the horn is continuously pressed, there is a sudden strong current passing through the impedance during the pressing period, and it will be able to work normally. When the current ends, it will not continue to work, and there are sometimes good and sometimes bad situations. 2. Sealing gap causing moisture: Although the interior of the micro horn is sealed, if the seal is not tight and water vapor or mist from the air enters during car washing, the contacts will also not work properly due to moisture.

When choosing a sports venue horn loudspeaker, the following factors need to be considered comprehensively: 1. Site size and layout: Select the appropriate number and type of horn speakers based on the actual area and layout of the sports venue. Generally speaking, the number of speakers should be slightly greater than the number of viewers to ensure that each audience can hear a clear sound. At the same time, it is also necessary to pay attention to the spacing and angle between speakers to avoid mutual interference and echo generation. 2. Sound quality requirements: Sports venues have high requirements for sound quality, so when choosing speakers, it is best to choose high-quality products. In addition, it is also necessary to pay attention to the frequency response, distortion rate and other parameters of the speaker to ensure the purity and authenticity of the sound quality. 3. Environmental factors: The environment of sports venues is relatively complex, such as air humidity, temperature, and other factors that may affect the performance of audio equipment. Therefore, when selecting speakers, these factors should be considered and products suitable for harsh environments should be selected. 4. Technical support: With the development of technology, the technology of audio equipment is also constantly improving. Therefore, when selecting sports venue speakers, attention should be paid to the technical characteristics and support services of the product to ensure the stable operation and convenient maintenance of the equipment. In short, selecting the appropriate horn speaker in a sports stadium is an important task. Through a reasonable sound reinforcement system design and high-quality linear array audio equipment, it can provide a better viewing experience for the audience, while also providing a more comfortable communication environment for athletes and coaches. I hope this article can provide you with some useful reference information to help you make wise choices when choosing sports venue speakers.

The definition and scope of application of reliability. The definition of speaker reliability is: "The ability of a horn speaker product to complete specified functions under specified conditions and within a specified time." It is the time quality indicator of a speaker product after leaving the factory, used to describe whether the horn loudspeaker is easily damaged and the degree of reliability during use. With the improvement of user requirements, the speaker structure is becoming increasingly complex (such as car speakers), the output power is increasing (such as PA speakers), and the usage environment is becoming increasingly harsh (such as outdoor speakers), which will lead to a decrease in the reliability level of speaker products. At the same time, the use of new materials, processes, or technologies can also increase the factors that make horn speakers unreliable. The "prescribed conditions" in the definition of reliability determine a wide range of reliability, and the reliability of a product is closely related to its working state, usage conditions, and environmental conditions for storage and transportation. The conditions can be divided into two categories: usage conditions and surrounding environmental conditions. The usage conditions refer to the stress conditions that act upon entering the interior of the product, including various electrical, chemical, and physical stresses. The surrounding environmental conditions include various environmental stress conditions such as temperature, humidity, air pressure, harmful gases, mold, salt mist, impact, vibration, and radiation. In this sense, environmental testing also belongs to the category of reliability testing. These stress conditions can be applied individually or comprehensively, and the combined application will have a more significant impact on the reliability of speaker products.

Taixing Minsheng Electronic Co., Ltd.s committed to research and development innovation of various types of products This high pitched horn speaker with a rated power of 50W and a fixed resistance of 4-16 ohms is optional PA loudspeaker features: All metal shell, good protection; High sensitivity 118db 1W/M Adopting U-shaped metal bracket, Windproof bracket,etc.easy and fast installation The speaker horn has a large size, commonly known as the "big horn" The appearance treatment process of the product is assembly line spray molding, with a lubricated surface and a full texture. Place of use: The product is suitable for language broadcasting, alarm monitoring, village to village communication engineering, and emergency broadcasting system terminals in water conservancy and meteorological departments.

In fact, the difference between constant voltage horn speaker and constant resistance speaker horn mainly lies in the difference in output form and application: 1. The difference between constant voltage and constant resistance in output form: We know that the output voltage does not change with the change of impedance value, so the number of amplifiers connected within the range of system power generally has no effect on the overall voltage of the amplifier. Generally, when selecting a constant voltage combination, in order to reduce line loss during transmission, it is necessary to use it in conjunction with a constant voltage PA loudspeaker (with a transformer inside), We know that the higher the voltage, the smaller the transmission line loss, and so is the transmission of our electricity. In broadcasting systems, the common output voltages include 70V, 90V, 120V, etc. The rated voltage of the load is required to be constant. The constant voltage amplifier and multiple constant voltage speakers are connected in parallel, and the total power of each speaker cannot exceed the total power of the constant voltage amplifier. If the rated load voltage changes, the power will also change accordingly. Fixed resistance power amplifiers generally require a certain output load resistance value, otherwise if the load impedance changes during use, the power will change accordingly. For example, if a 10 ohm 100W fixed resistance power amplifier is replaced with a 5 ohm overall power consumption, it will become close to 200W. 2. The difference between the application of constant voltage and constant resistance: Constant voltage is generally used in situations where there is not a high requirement for sound quality, but the transmission distance is relatively long; On the contrary, fixed resistance limits the transmission distance to within 100 meters, and is used in situations where the transmission distance is relatively close and there is a high demand for sound quality. So the broadcasting system is more commonly used for fixed voltage amplifier sound combinations, while fixed resistance amplifier sound box combinations are more commonly used in conference systems. There must be many friends who are curious here, but can the two be mixed up? Can I use a constant voltage amplifier with a constant impedance speaker? Actually, it is also possible, but it is not recommended to use this combination as it not only affects the sound quality, but also the lifespan of the device. Just like when I put the wheels of a motorcycle on a bicycle, it can still run, but the stakes are clear. We advocate for dedicated personnel, so it is usually used in conjunction. The above are some explanations and applications that have been extended to address the differences between constant pressure and constant resistance. I hope they can help you!

1. We advocate developing plans based on the site, relying solely on drawings without observing the actual site. The selection of ceiling speaker and the arrangement of PA Ceiling Speaker points are generally difficult to achieve the most ideal effect. There is a reference in the industry for the installation spacing between ceiling speakers: the distance between each two ceiling loudspeaker products is twice the distance from the in Ceiling Speakers to the ground. Usually, this installation method can ensure uniform sound throughout the venue, and installing more speakers is also a waste. However, it is necessary to configure the speaker power and speaker placement according to different venue environments, taking into account the location of the area where the entire venue's personnel (listeners) are frequently located Factors such as whether listeners frequently move, are they in a fixed position, whether they are standing or sitting more, and the level of background noise in the entire venue environment. The installation and layout of speakers in hotels, rooms, lobbies, corridors, restaurants, offices, supermarkets, display halls, and other venues, as well as in each local area, are different. To do a good job, there is no standard to copy. Just like a good hairstylist, hairstyles need to be designed based on each person's face shape, head shape, skin color, hair quality, and even personality, occupation, and other factors. In this regard, Even the simplest design and installation of ceiling speakers is not purely a technical issue. A good background music project is a combination of experience, technology, and art. 2. Regarding the selection of speakers and other equipment, many companies offer three options for you to choose from: poor, mid range, best, or in other words: cheap, average, most expensive, or some say: domestic, joint venture, or advanced. Provide three levels of solutions for customers to choose from. Many customers are also very satisfied with the opportunity to choose from three levels. This can be said to provide a very good service, but from our perspective, we believe that this is irresponsible behavior, it is just a commercial behavior, and it is irresponsible behavior. Of course, any product will come in several different price levels, including high-quality, low-quality, and even counterfeit products. I am not saying that there is good technology to play beautiful music even with poor quality speakers. It is impossible. What I am saying is that we need to tailor our background music plan, communicate with customers, understand the on-site conditions and functions, and provide the most reasonable layout based on these, rather than just offering three different price options for customers to choose from, The customer doesn't know much about your technology, and they also don't know what the effect of installing expensive speakers and ordinary speakers is. There is often a situation where customers choose a cheap solution, but after the entire project is installed, the effect sounds very poor, and even the sound of electricity inside the speaker can be heard. The solution is: cheap things are like this, only this effect can be achieved. These are irresponsible behaviors.

(1) Pre sign language: The left hand is upright in front, the right hand is extended horizontally behind, the backs of both hands are pressed against each other, placed in front of the chest, and the right hand is moved inward to the left, indicating advance. (2) Sign language for "Warning Sirens": Spread your left hand open, with your fingertips facing down in a "Å" shape, like a clock; Place your right index finger under the clock and simulate the shape of the clock by quickly and forcefully pressing forward twice, indicating an emergency bell or alarm, while also showing an emergency expression on your face. [Air-Raid Sirens] (1) Sign language for "air raid": extend your thumb, index finger, and little finger with your left hand, palm down, symbolizing the shape of the aircraft; Divide the five fingers of the right hand and place the palm to the left under the plane, symbolizing a row of bombs; The five fingers of the right hand fall separately, symbolizing the action of an airplane dropping a bomb. (2) Emergency sirens Sign language for "alarm": Spread your left hand open, with your fingertips facing down in a "Å" shape, like a clock; Place your right index finger under the clock and simulate the shape of the clock by quickly and forcefully pressing forward twice, indicating an emergency bell or alarm, while also showing an emergency expression on your face. [Clear Alarm] (1) Sign language for "alarm": Spread your left hand open, with your fingertips facing down in a "Å" shape, like a clock; Place your right index finger under the clock and simulate the shape of the clock by quickly and forcefully pressing forward twice, indicating an emergency bell or alarm, while also showing an emergency expression on your face. (2) Release (ending) sign language: Stand up with both hands, palms facing outward, thumb open, other four fingers bent and close to thumb, then wave both hands down while releasing the five fingers.

What are the types of alarms? According to the energy conversion method, it is divided into four categories: electric, electro-acoustic, pneumatic, and manual alarms. According to the sound pressure of the PA Loudspeaker signal, it can be divided into large, medium, and small alarms. The sound pressure level of large alarms is above 100 decibels, that of medium-sized alarms is tens of decibels, and that of small alarms is below tens of decibels. According to different usage conditions, it can be divided into two types: fixed alarm and mobile alarm. Mobile alarm mainly installs air defense alarm on cars. In addition, siren speakers, wired and wireless broadcasting, television, telephone, internet, and ringing gongs can also be used as auxiliary equipment and means for alarm. Under what circumstances will the air defense warning sound? At ordinary times, according to the relevant provisions of the Civil Air Defense Law of the China, trial sound can be conducted (for example, this year, the air defense alarm will be tested in the city on the third Saturday in September, the "National Defense Education Day"); During wartime, sound according to the requirements of the air defense alarm sound signal regulations. What should the masses do after the alarm speaker rings? The alarm speakers sound can be divided into normal trial sound and wartime sound. The purpose of sounding an air defense warning during normal times is to better verify the integrity of the city's air defense warning facilities and the sound effect of the alarm, so that the general public is familiar with the air defense warning signal, improve their national defense awareness and people's air defense awareness. The general public and past personnel do not need to take any measures, and can continue to maintain normal work and life order. During wartime, when citizens hear air defense warning signals, they should remain calm, carefully listen to the type of warning signal issued, and then take corresponding measures. The purpose and significance of organizing air defense warning tests during peacetime One is to implement national laws and regulations. The Law of the China on Civil Air Defense stipulates that "local people's governments at or above the county level may, when necessary, organize a trial air defense warning". The second is to further enhance the national defense awareness of the general public, strengthen people's awareness of air defense, warn the safety of urban residents, and improve their self rescue and mutual rescue capabilities in response to war and natural disasters. The third is to verify the integrity of the air defense alarm system, grasp the actual coverage of the alarm signal, and scientifically and reasonably deploy air defense alarms. The fourth is to organize air defense warning trials, which is of great significance for improving the ability to carry out the mission of "wartime air defense, peacetime services, and emergency support", and protecting the safety of people's lives and property. How to take action when hearing air defense warning signals during wartime? During wartime, when citizens hear air defense warning signals, they should remain calm, carefully listen to the type of warning signal issued, and then take corresponding measures. One is the action to be taken when hearing the advance warning during wartime Pre warning is a warning signal issued when the enemy is about to launch an air raid on a city. (1) Firstly, it is necessary to inform families and nearby personnel, especially those working underground and on high noise construction sites. (2) According to the division of labor in the family air defense plan: turn off gas, cut off power, close doors and windows, tap water, extinguish the fire, confine livestock and pets, cover food, water wells, transfer flammable materials, etc. (3) Carry the emergency backpack, support the old and young, and quickly enter the designated civil air defense project or Emergency evacuation site. (4) Residents with community or street civil air defense tasks should arrive at the designated location as soon as possible to fulfill their civil air defense duties. (5) Residents in public places are generally not advised to go home immediately. They should take protective measures nearby or seek shelter in temporary evacuation areas. The second is the actions to be taken when hearing air raid warnings during wartime An air raid warning is a warning signal issued when enemy air raid weapons are approaching the sky over a city and an attack on a city target has begun or is about to begin. (1) The civil air defense project should immediately close the protective closed doors, and residents who have entered the civil air defense project should be quiet. (2) Citizens who do not have time to enter the civil air defense project should be dispersed nearby and can hide next to or under low walls, flower beds, culverts, corners, tables, etc., or use helmets, blankets, plastic pots, wooden boards to protect important parts such as the head. (3) Avoid glass windows, high bookshelves, wardrobes, and hanging items indoors. (4) Avoid tall billboards, buildings, cranes, and high-voltage lines outdoors, and stay away from flammable and explosive areas such as gas stations and gas stations. The third is the actions to be taken when hearing the lifting of the alarm during wartime The lifting of the alarm is a warning signal issued when the danger of an enemy air raid has been lifted. After hearing the lifting of the alarm, citizens should return home and work in an organized and orderly manner. At the same time, under the unified organization of the unit or community where they are located, actively carry out self rescue and mutual rescue, fire extinguishing, emergency repair and other actions to eliminate the consequences of air strikes. How to quickly enter civil air defense projects after hearing warnings during wartime? (1) Obey the guidance of on-site staff, do not stay, crowd, or make noise. (2) Carry a backpack, do not clip or carry a bag, hold a child, and do not lead the child away. (3) When there is no light, you should vacate your right hand and lean towards the right side to explore and quickly enter the civil air defense project.