Building announcement sound system

NGÀY ĐĂNG 07/10/2025

Hoàng Phụng

Building Public Address System

In modern buildings, public address (PA) systems play an essential role in delivering information, guidance, and ensuring safety for occupants and employees within the facility.
Beyond daily announcements or background music, these systems can also integrate with fire alarm and security systems to deliver emergency alerts when necessary.
With many years of experience in deploying professional audio solutions, KPS offers synchronized, high-quality public address systems that meet international safety standards and are suitable for all types of buildings — from offices and residential complexes to shopping centers and factories.

What is a Public Address System?

A Public Address (PA) System is an electronic system designed to capture, amplify, and distribute audio across multiple zones or areas within a building or large space.

Its main purposes include:

• Broadcasting announcements or messages to the entire building or specific areas;

• Delivering emergency alerts to ensure timely evacuation and safety;

• Playing background music (BGM) or other audio signals for daily operation.

A standard PA system typically consists of:

• Microphones – to capture speech or audio signals and convert them into electrical signals;

• Audio Mixer – to combine and adjust multiple input signals before amplification (if needed);

• Amplifiers – to boost low-level signals from microphones or mixers to drive loudspeakers effectively;

• Loudspeakers – to convert amplified signals back into sound waves that are audible;

• Zone Controller – to manage broadcasting by zones or to the entire building;

• Auxiliary Components – such as signal processors, cabling, backup power supplies, and fault monitoring systems.

Classification of Public Address Systems

PRAESENSA

A fully IP-based PA/Voice Alarm system suitable for medium to large installations. All devices are network-connected, offering flexible scalability, redundancy, and centralized control through software or hardware interfaces.
Key advantages: smart power distribution, no single point of failure, easy configuration, and full compatibility with modern network architectures.

PAVIRO

An intermediate line designed for medium to large projects, balancing features, performance, and cost.
PAVIRO supports multi-zone operation, dynamic routing, and energy-efficient power management.
It supports both centralized and distributed architectures, allowing easy configuration from design to deployment.

PLENA VAS (Voice Alarm System)

A compact system for small to medium applications, offering plug-and-play simplicity at a lower cost than PRAESENSA or PAVIRO.
A PLENA VAS controller can manage up to 6 zones, integrating message management, emergency microphones, and a 240W amplifier. It can be expanded up to 120 zones via additional routers.
Ideal for schools, hotels, retail stores, and small offices requiring reliable yet simple audio and alarm functions.

PROSPERO

PROSPERO is an IP-based Public Address System developed by Bosch.

All PROSPERO components — call stations, interface modules, and IP speakers — connect directly via standard Ethernet, transmitting both audio and control signals through the network without requiring separate audio wiring.
The system supports PoE (Power over Ethernet) for multiple devices, simplifying power management.
PROSPERO allows flexible scalability for both centralized and distributed setups.

Key components include:

• Call Station PRP-CST – with touch screen, PTT button, and emergency controls;

• Interface Modules – such as PRP-IM1A (1 audio output) and PRP-IM2C1A (2x2 control + 1 audio output);

• IP Speakers – like PRP-UC15L-IP (built-in amplifier) and passive extension speakers.

Advantages of Building PA Systems

High sound quality & speech intelligibility
Bosch prioritizes clarity and precision in voice and music reproduction, ensuring messages and alerts are easily understood and accurately transmitted.

Full IP connectivity & system integration
The PRAESENSA system is fully IP-based, enabling easy expansion, centralized management, and integration with fire alarm, security, or building management systems.

High redundancy & reliability (no single point of failure)
Bosch designs its systems with multiple redundancy layers — for network, power, and devices — ensuring continuous operation even in case of partial failure.

Cost efficiency & energy savings
Thanks to Bosch’s “smart-power concept” and network-based design, installation and operational costs are significantly reduced.

Scalability & adaptability
As building needs evolve, Bosch systems can be expanded or reconfigured without redesigning the entire network.

User-friendly control interface
The system’s intuitive software interface can be managed via PC, tablet, or smartphone, making operation simple and efficient for non-technical staff.

International standards & long-term durability
All Bosch products meet global PA and voice alarm standards (e.g., EN 54-16) and offer long service life — with many installations operating reliably for over 20 years.

Modular design & flexible expansion
Bosch PA systems can scale from small setups to hundreds of zones, from single broadcasting points to complex multi-site configurations.