What is Announcement Sound? Structure, Classification & Top Systems

Public Address System (PA System) is an audio technology solution designed to convey messages, warnings or instructions to a large area through the acquisition, processing and transmission of audio signals.

The system operates based on the principle of converting audio signals from microphones and peripherals, then amplifying them through an amplifier and sending them to speakers with appropriate quality. 

Public address sound has 8 main applications including: outdoor public spaces, schools, apartments, hospitals, supermarkets and commercial areas, office buildings, train stations-bus stations-airports, and factories-plants. 

According to statistics, 85% of schools in the US use public address systems integrated with security systems, while research in the UK shows that soft music in hospitals reduces patient stress levels by 20%.

A standard public address system consists of 7 main devices: announcement microphone (receives input sound), announcement speaker (broadcasts sound to listeners), amplifier (amplifies signal), central controller (manages the entire system), zone call station (selects specific broadcasting zones), peripheral devices (provides audio content) and connection accessories (ensures stable transmission).

In terms of classification, public address systems are divided into three main types: Analog (using continuous electrical signals, low cost but susceptible to interference), Digital (converting signals into digital form, higher quality but complex), and IP (transmitted over the Internet, most flexible but dependent on network connection). 

Reputable brands on the market include TOA, Bosch, JBL, Yamaha, Bose, ITC, CAF, Thunder and OBT. Each brand has its own characteristics and applications to suit specific usage needs. For the system to operate stably, durably and achieve optimal efficiency, you need to pay attention to some important factors during the design, equipment selection and installation process.

What is Notification Sound?

A Public Address System (PA System) is a sound technology solution designed to convey messages, warnings or directions to a large area. It is an indispensable part of modern infrastructures such as schools, hospitals, factories, airports, and public areas. 

How does the public address system work?

The public address system operates on the principle of receiving, processing and transmitting audio signals. This process includes:

• Audio signal reception: Microphones or peripheral devices (such as computers, music players) receive input audio signals.
• Signal processing: The central controller or amplifier processes the signal and amplifies the sound to ensure proper quality and volume.
• Signal: The loudspeaker broadcasts an audio signal to listeners in the designated area.

In which fields is the public address system applied?

8 common applications of public address systems:

• Outdoor public address system: This system is used in parks, squares, stadiums to broadcast announcements or organize events. 
• School Public Address System: School public address systems help broadcast internal announcements, bells, or evacuation instructions in case of emergency. 
• Public address system in apartment: In apartment buildings, public address systems are used to broadcast management announcements, emergency warnings, or information about community events.
• Hospital Public Address System: In hospitals, public address systems play an important role in calling patients, making emergency announcements or playing relaxing background music. A study in the UK showed that soft music in hospitals reduced patients' stress levels by 20%.
• Public address system in supermarkets and shopping malls: This system is used to announce promotions, find lost children or guide customers. For example, Vincom Landmark 81 shopping mall uses a modern public address system to serve thousands of customers every day.
• Public address system in buildings and offices: In office buildings, public address systems are used to broadcast internal announcements, fire alarms, or evacuation instructions.
• Public address system at train stations, bus stations, airports: Public address systems at stations, bus stations, and airports help announce schedules, flight delays, or guide passengers.
• Public address system in factories, workshops, enterprises: In factories, public address systems are used for production coordination, safety warnings or emergency announcements.

What Equipment Does Sound Announcement Include?

The public address system consists of 7 main devices: microphone, speaker, amplifier, central controller, zone call station, peripheral devices and internal connection devices. Each device in the system plays an important role, from receiving audio signals, processing, amplifying to sending signals to speakers.

1. Notification microphone

Announcement microphone is an input device, responsible for receiving sound from the speaker or source. Announcement microphones are often designed with high sensitivity, good anti-interference ability and can be used in many different environments.

Role:

• Receive audio input signal from speaker.
• Ensure clear sound, without distortion or noise.
• Some types of announcement microphones also have a built-in broadcast zone selection function.

2. Announcement speaker

Announcement speakers are output devices, responsible for transmitting audio signals to listeners. Announcement speakers come in many types such as ceiling speakers, box speakers, compression speakers, column speakers, etc., depending on the space and purpose of use.

Role:

• Delivers sound to listeners with wide, clear coverage.
• Designed to suit every environment: indoors, outdoors, public areas…

3. Amplifier

Amplifier is a device that amplifies the audio signal, ensuring that the signal is strong enough to be emitted through the speaker with the best quality. Amplifiers are often integrated with additional features such as volume adjustment, tone balance (bass, treble), and radio zone selection.

Role:

• Amplifies audio signals from microphones or peripherals.
• Provides power to the speaker.
• Adjust the volume and sound quality to suit the space.

4. Central controller

The central controller is the “brain” of the public address system, responsible for managing and coordinating the entire system. This device allows you to select a broadcast zone, play background music, or make emergency announcements.

Role:

• Manage and control devices in the system.
• Select specific radio zones or broadcast to all zones simultaneously.
• Integrate features such as timer, alarm, or connection to fire alarm system.

5. Zone call station

A zone call station is a device that allows the user to select a specific broadcasting zone within the system. This device is usually located at the reception desk, control room or operations center.

Role:

• Select a specific radio zone or broadcast to multiple zones simultaneously.
• Connect directly to the central controller to broadcast announcements.

6. Peripheral devices

Peripheral devices include audio sources such as CD players, USBs, computers, or telephones. These devices provide audio content such as background music, pre-recorded announcements, or emergency messages.

Role:

• Provide audio input content to the system.
• Connects directly to amplifier or central controller.

7. Connection accessories

Connection accessories include speaker wires, signal wires, jacks, rack cabinets, and other supporting devices. These are indispensable components for connecting and ensuring stable operation of the system.

Role:

• Connect devices in the system to ensure stable signal transmission.
• Protect and organize devices in the system neatly and safely.

What Types of Public Address Systems Are There? 

Public address systems are divided into three main types: Analog, Digital, and IP. Each type has its own characteristics, along with advantages and disadvantages that suit each specific usage need. 

1. Analog announcement sound system

Analog public address system is a traditional system that uses continuous audio signals in the form of electrical waves (analog signal). This is the oldest technology in the field of public address.

Analog systems operate by transmitting audio signals over wires without any encoding. The main components include microphones, amplifiers, speakers, and signal wires. Audio signals are transmitted directly from the source to the speakers without any digital processing.

Advantages:

• Natural Sound: Analog signals retain the characteristics of sound waves, providing realistic and vivid sound quality.
• Low cost: The cost of equipment and installation of Analog systems is cheaper than modern systems.
• Easy to install and operate: Simple structure, no high technical requirements.
• Suitable for small spaces: Analog systems work well in small or medium-sized spaces.

Disadvantages:

• Susceptible to Signal Noise: Analog signals are susceptible to environmental factors such as voltage, temperature, or humidity.
• Loss of quality over distance: As the signal is transmitted over long distances or copied multiple times, the sound quality will gradually decrease.
• Difficult to scale: Analog systems are not flexible in scaling or integrating with other technologies.
• Bulky: Analog devices are often large and heavy, making them difficult to move or install in limited spaces.

2. Digital announcement sound system

Digital public address system is a technological step forward compared to Analog, using audio signals encoded in digital (binary) form for transmission and processing.

Digital systems convert audio signals into digital form, then process and transmit them through digital devices such as digital amplifiers, central controllers, and speakers. Digital signals help reduce noise and enhance sound quality.

Advantages:

• High sound quality: Digital signals are not degraded when transmitted over long distances or copied multiple times.
• Effective noise filtering: Digital system is capable of eliminating noise and signal interference, providing clear sound.
• Convenient storage: Audio signals can be stored on compact devices such as USB, hard drive, or on the cloud.
• Easy integration: Digital system can connect with other modern devices such as computers, smartphones.

Disadvantages:

• High Cost: Digital systems require a larger initial investment than Analog.
• Complexity in operation: Installation and operation of Digital systems require high technical skills and specialized personnel.
• Less realistic: Some users say that Digital sound, while clear, lacks the naturalness of Analog.

3. IP public address system

IP public address system is the most advanced technology today, using the Internet to transmit audio signals instead of physical wires.

The IP system operates on a LAN/WAN network platform, using the IP protocol to transmit audio signals. Devices in the system are connected to each other via the network and are controlled by software on a computer or phone.

Advantages:

• No distance limit: Audio signals can be transmitted anywhere as long as there is an Internet connection.
• Easy management: IP system allows remote management and control via software.
• Save on wiring costs: No need for complex wiring, IP systems take advantage of existing network infrastructure.
• Flexible integration: IP systems are easily integrated with other systems such as surveillance cameras and fire alarm systems.

Disadvantages:

• Internet Dependency: IP systems require a stable network connection, if the network is lost it will affect operations.
• Security Risk: There is a risk of being hacked if good security measures are not taken.
• High cost: IP systems have high initial investment costs, especially for large-scale projects.
• Bandwidth Consumption: Transmitting audio signals over the network consumes a lot of Internet capacity.

Which Public Address System is Popular Today?

There are 8 famous brands providing public address systems that are trusted and used by the market today: JBL, CAF, Yamaha, THUNDER, TOA, BOSCH, BOSE, ITC and OBT.

1. JBL public address system

JBL is a famous audio brand from the US, known for its high quality products, modern design and realistic sound. JBL provides suitable announcement sound solutions for both indoor and outdoor spaces.

Highlights:

• Superior sound quality: JBL uses advanced sound technology, delivering clear, vibrant sound.
• High durability: JBL devices are designed to withstand harsh environmental conditions, especially outdoor speakers.
• Easy integration: JBL systems can connect to other devices such as microphones, amplifiers, and central controllers.

2. CAF announcement sound system

CAF is a famous audio brand with products manufactured on modern technological lines, providing stable and high quality sound performance.

Highlights:

• Advanced technology: CAF integrates many new audio technologies, helping to reduce noise and enhance sound clarity.
• Flexible design: CAF products have a compact design, easy to install in many different spaces.
• Reasonable price: CAF offers audio solutions at competitive prices, suitable for the budget of many projects.

3. Yamaha Public Address System

Yamaha is a leading audio brand from Japan, famous for its high quality products and outstanding durability.

Highlights:

• Natural Sound: Yamaha focuses on reproducing realistic sound, suitable for spaces requiring high sound quality.
• High durability: Yamaha equipment is designed to operate reliably for a long time.
• Integrating modern technology: Yamaha offers digital audio solutions with remote control capabilities.

4. THUNDER announcement sound system

THUNDER is an audio brand specializing in providing high-power announcement sound solutions, suitable for large spaces.

Highlights:

• Powerful output: THUNDER devices are capable of producing loud sounds, suitable for high noise areas.
• Rugged Design: THUNDER focuses on durability and endurance in harsh environments.
• Affordable: THUNDER products are reasonably priced, suitable for large-scale projects.

5. TOA public address system

TOA is Japan's leading audio brand, renowned for its high quality public address solutions and outstanding reliability.

Highlights:

• Product diversity: TOA offers a wide range of products from speakers, amplifiers, to microphones, suitable for all usage needs.
• Advanced Technology: TOA integrates features such as radio zone selection, background music playback, and emergency announcements.
• High durability: TOA devices are designed to operate stably for a long time.

6. BOSCH announcement sound system

BOSCH is a famous German audio brand, known for its smart audio solutions and easy integration with other systems.

Highlights:

• High sound quality: BOSCH uses advanced technology to ensure clear, noise-free sound.
• Smart integration: BOSCH systems can be connected to fire alarm systems, surveillance cameras, and other security devices.
• High reliability: BOSCH is designed to operate reliably in emergency situations.

7. BOSE announcement sound system

BOSE is a high-end audio brand from the US, famous for products with modern design and outstanding sound quality.

Highlights:

• True sound: BOSE focuses on reproducing natural and vibrant sound.
• Luxurious design: BOSE products have sophisticated designs, suitable for high-end spaces.
• Easy to install: BOSE offers compact, easy-to-deploy audio solutions.

8. ITC Public Address System

ITC is an audio brand from Taiwan, known for its affordable products and diverse features.

Highlights:

• Reasonable Price: ITC offers audio solutions at competitive prices.
• Diverse features: ITC integrates many features such as zone selection, background music playback, and emergency announcements.
• Easy to use: ITC products have friendly interface, easy to operate.

9. OBT announcement sound system

OBT is a renowned audio brand with analog and IP public address solutions.

Highlights:

• Product diversity: OBT offers both analog and IP audio systems, suitable for many usage needs.
• Versatile Features: The OBT system integrates features such as timer, zone selection, and background music playback.
• Affordable: OBT offers products at affordable prices.

What to Note When Installing a Public Address System?

To ensure the system operates stably, durably and achieves optimal efficiency, you need to pay attention to 6 important factors: space survey, equipment selection, schematic design, proper installation, periodic maintenance and choosing a reputable installation unit.

1. Survey the installation space

Before installation, space survey is the first and most important step. This helps you identify factors affecting sound quality and choose the right equipment.

Factors to consider:

• Space area: Determine the area that needs sound coverage to calculate the appropriate number of speakers and amplifier capacity.
• Environmental characteristics: Indoor or outdoor space, whether there is a lot of noise, weather conditions (if outdoors).
• Building materials: What materials are the walls, ceilings, and floors made of (concrete, plaster, glass, etc.) because they affect the ability to reflect and absorb sound.

2. Choose the right equipment

Choosing the right equipment for your needs and installation space is a decisive factor in the effectiveness of the public address system.

Equipment selection criteria:

• Public address speakers: Choose the right type of speaker for the space (ceiling speakers, horn speakers, box speakers, etc.). For example, ceiling speakers are suitable for offices, while horn speakers are suitable for factories or outdoors.
• Amplifier: The amplifier power must be greater than the total power of the speaker to ensure stable operation. The general rule is that the amplifier power should be 20-30% greater than the total power of the speaker.
• Microphone: Choose a microphone with high sensitivity, good anti-interference ability, suitable for the usage environment.
• Central controller: If you need to manage multiple speaker zones, choose a controller that has the ability to zone and adjust volume independently.

3. Design installation diagram

A detailed installation diagram helps you deploy the system scientifically, save costs and easily maintain later.

Design elements:

• Speaker installation location: Make sure the speakers are evenly distributed, with appropriate distance between speakers so that the sound covers the space evenly.
• Signal line: Calculate the length of the wire, avoid making the wire too long to cause signal degradation.
• Central equipment location: Place the amplifier and central controller in an accessible location for ease of operation and maintenance.

4. Proper installation

Proper installation not only ensures efficient system operation but also increases the durability of the equipment.

Notes on installation:

• Correct connection: Make sure the connections between the speakers, amplifier and central control unit are made correctly to avoid short circuits and fires.
• Secure the device: Especially for wall-mounted speakers or outdoor horn speakers, a sturdy mount should be used to ensure safety.
• Pre-operational check: After installation, the entire system should be checked to ensure there are no technical errors.

5. Regular maintenance

Regular maintenance helps the public address system operate stably and prolongs the life of the equipment.

Maintenance steps:

• Check connections: Make sure wires and plugs are not loose or damaged.
• Clean equipment: Clean speakers, amplifiers and other equipment to avoid dust and dirt that reduces performance.
• Sound quality test: Measure sound to detect and fix errors such as distortion and signal noise.
• Replace damaged components: If damaged wires or equipment are found, they should be replaced immediately to avoid affecting the entire system.

6. Choose a reputable supplier

Choosing a reputable supplier and installer helps you ensure equipment quality, after-sales service and technical support.

Criteria for selecting suppliers:

• Genuine products: Ensure the device has clear origin and full warranty.
• Installation experience: Choose a unit with experience in implementing similar projects.
• Technical support: The supplier must have a team of professional technicians, ready to assist when needed.

Phuc Truong Audio Consulting and Installation of Professional and Reputable Public Address Sound Systems.

With many years of experience in the audio field, Phuc Truong Audio is proud to be the unit Providing professional audio announcement solutions, the leading prestige in Vietnam. We provide a full range of genuine audio equipment, suitable for all customer needs and budgets.

Phuc Truong Audio's team of experienced technicians will directly survey, advise, design and install the optimal public address system, ensuring the best sound quality. We also provide quick and professional maintenance and repair services.

If you need advice or installation of a public address system, please contact Phuc Truong Audio for dedicated support.

Frequently Asked Questions.

What systems can the public address system be combined with?

The public address system can be integrated with:

• Fire alarm system: Issue emergency notification when there is a problem.
• Surveillance Camera: Combine to automatically alert when detecting unusual movement.
• Security System: Notifies of safety related issues in the building.

Should I use wireless speakers for my public address system?

Wireless speakers are suitable for spaces that require quick installation or are difficult to wire, but:

• Costs more than traditional speakers.
• Dependent on wireless signal: May experience interference in environments with multiple electronic devices.

Refer best selling bluetooth speakers at Phuc Truong Audio.

What types of announcement microphones are there and what are their applications?

There are 3 common types of announcement microphones:

• Desktop microphone: Used in control room or reception desk, suitable for zone selection announcement.
• Wireless microphones: Used in mobile spaces or events that require freedom of movement.
• Ceiling or wall mounted microphone: Suitable for fixed spaces such as meeting rooms or hallways.

How many types of public address speakers are there and which one should I choose?

Announcement speakers include:

• Ceiling speakers: Suitable for office, meeting room or indoor space.
• Horn speakers: For factories, stadiums or outdoors.
• Box speaker: Suitable for corridors, commercial buildings.
• Column speakerUsed in churches and halls.

Choose speaker type based on usage environment and volume requirements.

How much power does an amplifier need to ensure stable operation?

The amplifier must have a capacity at least 20-30% greater than the total. speaker power to ensure stable operation and avoid overload. For example, if the system has 10 speakers with 30W capacity, the amplifier needs to have a minimum capacity of 390W.

How many audio zones can the central controller manage?

Audio zone management capabilities depend on the controller model:

• Basic lines manage 4-6 zones.
• Higher end models, such as the TOA VM-3000, can manage up to 60 zones or more.

How much does it cost to install a public address system?

The cost of installing a public address system ranges from 20 million to hundreds of millions of VND, depending on the scale, number of devices and technology used (Analog, Digital or IP).

What factors affect the cost of system implementation?

System implementation costs are affected by:

• Space size: Large or multi-story areas will require a higher number of speakers and amplifiers.
• Technology Type: IP systems are generally more expensive than Analog and Digital.
• Installation environment: Outdoor requires waterproof equipment with higher cost.
• Equipment Brand: Brands like JBL, TOA, BOSCH are usually more expensive than ITC or OBT.

If you are looking for a professional and reputable consulting and installation unit for public address sound systems, please contact us immediately. Phuc Truong Audio for assistance.