# ProAudium
> ProAudium are specialists in PAVA and safety sound maintenance, covering London and the South East. We maintain voice alarm, safety sound, ESS, EVCS and PAGA systems to BS 5839-8, BS EN 50849 and BS 6259, with ISO 9001:2015 certification from a UKAS-accredited body. Our focus is the long-term maintenance relationship and the documented condition of the system, rather than installation work.

## Key pages
- [Home](https://proaudium.com/): Overview of services, philosophy and contact.
- [Services](https://proaudium.com/#services): Maintenance, call-outs, repairs, upgrades, compliance planning and consultancy.
- [Who we work with](https://proaudium.com/#clients): Fire and security contractors, M&E contractors, facilities managers and building owners.
- [Acoustic modelling](https://proaudium.com/#modelling): LiDAR scanning, 3D acoustic models and STI predictions ahead of installation.
- [AllLogged](https://proaudium.com/#alllogged): Field documentation app for photo capture, location tagging and cloud-backed records.
- [Knowledge Hub](https://proaudium.com/#knowledge): Technical guides and testing advice, with the first articles publishing during 2026.
- [Contact](https://proaudium.com/#contact): Speak to Nigel Williams or David Read.
- [Martyn's Law guide](https://proaudium.com/martyns-law/): Static guide to Martyn's Law (Terrorism (Protection of Premises) Act 2025) covering tier thresholds, the four required procedures and the communication procedure question, with a link to the ten-question tool at https://proaudium.com/#martyns-law.
- [PAVA Standby Battery Calculator](https://proaudium.com/battery-calculator/): Free tool to size PAVA standby batteries to BS 5839-8:2023 Annex C, with derating factors derived from Peukert's law. Three levels (quick estimate, detailed, and full manual with site measurements), a calculation record output showing every term and its source, and built-in engine self-tests.

## Topics covered
- PAVA (Public Address Voice Alarm) maintenance, testing, repair and upgrades.
- Voice alarm and safety sound standards: BS 5839-8, BS EN 50849, BS 6259, BS EN 54-16, BS EN 54-24, BS 5839-9, BS 8629, BS 7827.
- Loudspeaker circuit impedance testing and year-on-year trending with calibrated equipment.
- Subjective intelligibility testing and STI measurement.
- ESS (Emergency Sound System), EVCS (Emergency Voice Communication System), PAGA (Public Address General Alarm), AFILS (Audio Frequency Induction Loop System).
- Structured compliance roadmaps for systems progressing towards full BS 5839-8 or BS EN 50849 compliance across multiple budget cycles.
- ISO 9001:2015 certified service delivery (British Assessment Bureau, UKAS-accredited, certificate 220471): calibrated test equipment, controlled records, structured corrective action.
- Acoustic modelling and LiDAR scanning to predict and compare voice alarm coverage before installation.
- AllLogged: in-field photographic logging and audit-ready documentation.
- Martyn's Law (Terrorism (Protection of Premises) Act 2025): tier thresholds, the four required procedures (evacuation, invacuation, lockdown, communication), and how voice alarm systems can or cannot deliver invacuation and lockdown messages.
- PAVA standby battery sizing to BS 5839-8:2023 Annex C: minimum battery capacity from quiescent and alarm demand, derating factors derived from Peukert's law and manufacturer discharge data, and the 1.25 ageing and temperature allowance.

## What this site does not cover
- Legal advice on compliance with the Terrorism (Protection of Premises) Act 2025.
- Security consultancy and counter-terrorism planning.
- Terrorism risk assessments.
- Compliance certification under the Act.
- Fire alarm installation, fire risk assessment, or fire detection system maintenance.
- New PAVA installation contracts (we are a maintenance and consultancy specialist, not an installation contractor).