Voice Alarm vs Public Address Systems: Why the Inter-M EVA Series Redefines Safety, Compliance & Control

When it comes to audio systems in public buildings, many professionals default to Public Address (PA) solutions. But in high-stakes environments where life safety is on the line, Voice Alarm (VA) systems are not just beneficial - they are strongly recommended and sometimes the only option to meet complex fire safety regulations, particularly in large buildings and campus sites.

Too often, PA and VA systems are confused or used interchangeably, leading to dangerous oversights in design, compliance, and functionality. So, what exactly differentiates a Voice Alarm system from a Public Address system? And why is Inter-M’s EVA Voice Alarm range considered one of the most reliable, future-ready VA solutions on the market?

In this comprehensive guide, we’ll unpack the real-world, regulatory, and technical distinctions between VA and PA systems. We’ll also explore how Inter-M’s EVA range, with its EN54 certification, modular design and browser-based interface, is raising the bar for life-safety audio systems globally.

“It’s a life-safe​ty system. Everything about it is built for resilience, redundancy and reliability.”

Pete George, Audio Specialist, CIE-Group

What is a Public Address (PA) System?

A Public Address system is primarily designed for broadcasting general information: announcements, paging, background music, and sometimes crowd control. These systems are common in:

• Retail environments
• Office buildings
• Education campuses
• Transportation hubs
• Entertainment venues

They typically consist of:

• Microphones
• Music / audio sources
• Amplifiers
• Speakers
• Signal processing units (mixers, matrices and pre-amplifiers)

While PA systems may be robust and high-quality, they are not designed or certified to operate in emergencies. This is where the crucial differences with Voice Alarm systems begin.

What is a Voice Alarm (VA) System?

A Voice Alarm System is a type of PA system built and certified to operate during emergency situations, such as fires, evacuations, or security threats. Beyond simply making announcements, VA systems:

• Deliver pre-recorded and live emergency instructions
• Automatically switch to backup power and standby system components (such as amplifiers) should they develop a fault
• Self-monitor for faults or failures
• Are certified under rigorous safety standards, like EN54 in the UK/EU

“From an equipment point of view, they’re pretty much the same,” explains Pete George. “You’ve got microphones, amplifiers, speakers - the basic hardware components are very similar. But with voice alarm, you’re talking about a life safety system. That changes everything.”

Voice Alarm vs Public Address: Key Differences

In short: PA systems are for convenience. VA systems are for compliance and safety.

EN54 explained: The standard that makes Voice Alarm mandatory

EN54 is the European standard for fire detection and fire alarm systems. It sets the benchmark for the components of voice evacuation systems in public buildings and high-risk environments, alongside the BS5839 standard which covers the design and installation of the overall system, testing, comissioning and maintenance.

EN54-certified Voice Alarm systems must:

• Detect and notify of any system faults in real-time
• Have automatic backup power systems (e.g., batteries)
• Include redundant amplifiers and signal paths
• Continuously monitor microphone status, speaker line integrity, and more

“If you want a microphone on the system, it has to be monitored. If you have speaker lines, they have to be monitored,” says Pete. “And on top of that, you need redundancy.”

Failing to meet these criteria can result in non-compliance, legal consequences, and—most importantly - lives at risk during emergencies.

The Inter-M EVA Voice Alarm Range: A Game-changer for life safety audio

At the 2025 Fire & Security Show, Inter-M’s EVA Voice Alarm Series took centre stage, showcasing an all-in-one, scalable, and fully EN54-certified VA system.

Built for performance, simplicity, and remote access, the EVA system provides peace of mind for integrators, facilities managers, and safety officers alike.

Why Inter-M EVA? Key advantages at a glance:

• EN54-16 & EN54-4 certified
• Remote browser-based interface for monitoring and updates
• Fully monitored system including speaker lines and microphones
• Redundant amplifier & power supply switching
• Only 5 core components required
• Hot-swappable amplifiers for zero downtime
• Up to 24 microphone stations supported
• Modular and scalable architecture

EVA's Architecture: Five core components for total control

Inter-M’s EVA system is engineered to be intuitive yet powerful, consisting of just five primary modules:

1. Microphones – Up to 24 monitored stations
2. Matrix/Processor – Software-driven central brain of the system
3. Amplifiers – Including hot-swappable and redundant models
4. Battery Charger Unit – Ensures backup power during mains failure
5. Speaker Line Monitoring Units – Real-time integrity checks

“The clever bit is all in the background,” Pete George says. “On the EVA system, everything is software managed - redundancy, monitoring, configuration - and it’s accessible via a browser-based interface.”

This not only ensures rapid deployment and configuration but also enables real-time diagnostics and remote updates from anywhere in the world.

Scalability and flexibility for every environment

Whether you’re installing in a small retail site or a multi-zone healthcare complex, the EVA system can adapt without major hardware changes.

“You can mix and match amplifiers,” Pete says. “We do a 240-watt amp, but you can combine different units to meet your exact zone requirements. And if you need to change things later? Just reconfigure via software.”

This makes Inter-M EVA a future-proof solution that supports expansion and upgrades without system overhauls.

Real-World Applications for the Inter-M EVA System

Healt​hcare

Hospitals and care homes require fast, clear and reliable evacuation capabilities. EVA ensures fault-tolerant communications even in chaotic conditions.

Education

From primary schools to universities, safety announcements must be intelligible and quick. EVA supports multi-zone paging and lockdown messaging.

Commercial Offices

Downtime equals cost. EVA’s hot-swappable amps and remote diagnostics help maintain uptime with zero disruption.

Transportation Hubs

Airports and train stations demand zone-specific evacuation and multilingual capabilities. EVA delivers clarity, redundancy, and zone flexibility.

Retail and Leisure

Shopping malls and event venues can’t afford confusion during emergencies. EVA offers seamless integration of music, announcements, and life-safety functions in one system.

Remote Access & Monitoring: A New Era of VA Management

One of EVA’s standout features is its browser-based Graphical User Interface (GUI). This allows facilities teams and integrators to:

• Conduct real-time system checks
• Log and review faults
• Deploy software updates remotely
• Access from any location worldwide

“Whether you’re managing a school campus, transport hub, shopping centre, or healthcare site, this level of access and insight is a game changer,” says Pete.

Installer-Friendly Design: Simplifying Complex Installs

VA systems are traditionally complex, but EVA was designed with integrators in mind. Its modular architecture, minimal cabling, and hot-swappable hardware mean:

• Faster installs
• Easier maintenance
• Scalable upgrades
• Simplified troubleshooting

Combined with CIE-Group’s training and support, EVA gives integrators a shorter learning curve and quicker ROI.

Why the Inter-M EVA System leads the VA market

When compared with other VA solutions, EVA consistently stands out due to:

Final Thoughts: Voice Alarm is not optional – it’s essential

The days of relying solely on PA systems for emergency announcements are long gone. With the rise in regulatory enforcement and increasing risk environments, Voice Alarm systems are now a non-negotiable component of any public building's safety infrastructure.

The Inter-M EVA Voice Alarm series stands out not only for meeting the highest compliance standards but for making VA deployment easier, smarter, and more accessible than ever before.

“It’s not just an audio system anymore,” Pete George concludes. “It’s an essential life-safety network that has to work perfectly - every single time.”

One System, Dual Function: Voice Alarm and Public Address in perfect harmony

A common misconception among installers and end-users is that Voice Alarm and Public Address systems must be deployed separately. In the past, this may have been true - VA systems were strictly for emergency use, while PA systems handled daily communication needs like announcements and background music.

However, the Inter-M EVA system eliminates this separation entirely. By design, EVA delivers both Voice Alarm and Public Address functionality in a single, unified platform — offering maximum value, performance, and flexibility.

“You don’t need two separate systems anymore,” says Pete George. “EVA handles everything - everyday paging, scheduled messages, background music, plus full EN54-certified voice evacuation. It’s all managed from one software interface.”

This dual-purpose capability simplifies installations and reduces costs significantly. Instead of duplicating infrastructure, integrators can use the same microphones, amplifiers, and speaker zones for both daily communications and emergency functions - while still maintaining full EN54 compliance.

The system allows users to:

• Schedule and broadcast routine announcements
• Deliver live pages to specific zones
• Broadcast background music across selected areas
• Instantly override all channels for emergency voice evacuation messages and live emergency voice announcements

Because it’s software-driven, switching between general PA and emergency VA modes is seamless and automatic - with priority-based logic ensuring that life-safety messages always take precedence.

This integration of VA and PA into a single system is particularly beneficial for environments such as schools, hospitals, transport hubs, and retail complexes, where consistent communication is needed - but safety cannot be compromised.

With the Inter-M EVA system, facilities get the best of both worlds: day-to-day audio functionality and critical emergency readiness, all from one intelligent, robust solution.

Interested in Inter-M’s EVA Voice Alarm System?

Whether you’re designing a new facility or upgrading an existing audio infrastructure, Inter-M EVA offers the power, flexibility, and compliance needed to meet today’s safety challenges.

Contact CIE-Group today to learn more about the Inter-M EVA range, book a demo, or access training and support from our expert team.

Download the full Inter-M EVA brochure below:

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