This case study highlights the implementation of a certified voice evacuation and public address system in the Żeleźnica Tunnel on the Struma Motorway, Bulgaria’s longest road tunnel. The project features 4 PAVA racks in 2 amplification rooms, 194 loudspeaker lines, 82 high-power ABT-TNL100 tunnel speakers, and 24 ABT-T2430 horn speakers for escape routes, delivering a total of 9000 W. The system ensures clear emergency communication and integrates with advanced tunnel infrastructure.

Tunnel Żeleźnica – VA System implementation

AMBIENT SYSTEM is a European producer and provider of modern PAVA Systems and Intercom Solutions for the dynamically developing security communication.

We deliver scalable and versatile communication systems, from certified Public Address Voice Alarm (EN-54) and loudspeakers to advanced Intercom Solutions. Our products effectively improve safety in all types of facilities, including public and educational buildings, railway stations, airports, tunnels and industrial sites.

Ambient System

Ambient System_case study

TRVT aimed to implement advanced, remotely managed and monitored PAVA (Public Address and Voice Alarm) solutions, integrating automatic sound level control and seamless SNMP-based integration with their control platform. Ambient System delivered a comprehensive solution under a long-term framework agreement, including EN54-certified, climate-resistant loudspeakers (customized for the harsh Swedish climate and platform environments), intelligent amplifier modules for platform displays, and the smartVES PAVA system. Key features included intelligent sound level control to optimize message clarity for passengers and reduce noise for residents, self-testing SPL/STI using smartVES sensors for remote diagnostics, and the ICO MAM amplifier module supporting platform displays and clocks. The project milestones spanned from technical proposal development and acoustic simulations in 2023, through factory acceptance testing and initial orders in 2024, to successful client acceptance in 2025. An example installation at Linköping railway station included adaptive noise sensing microphones, a control unit, an audio processor, 129 loudspeakers, and 24 speaker lines, all focused on calibration, reporting, and noise minimization.

The smartVES PAVA System by Ambient System is an advanced voice alarm and public address solution designed for clear, intelligible emergency messaging. It features automated acoustic calibration, adaptive filtration, and real-time noise tracking to optimize speech clarity in complex environments. Modular and scalable, smartVES is ideal for airports, stadiums, shopping centers, and industrial facilities.

smartVES - Introduction

Ambient System’s integrated solution combines Public Address/Voice Alarm (PAVA) and IP intercoms for tunnels, ensuring clear communication and safety. Advanced DSP, noise reduction and automatic volume control optimize speech intelligibility in harsh, noisy environments. The system is fully digital, scalable and integrates with SCADA, CCTV and other safety systems for efficient emergency response.

smartVES PAVA System for tunnel applicatons

20230724_render_smartVES.jpg

The smartVES system has been designed to offer exceptional versatility and it is therefore equally suitable for medium-range buildings as well as complex commercial structures such as train stations,airports, refineries, sport stadiums, shopping malls etc. The system’s architecture is based on proven fibre-optic Ethernet connectivity between control units and other elements of the system thus enabling digital transmission of voice messages, including public address functions and music.

PAVA System smartVES

A TCP/IP-based Public Address System, certified to comply
with the EN54 standard.

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