Design
Voxiss design services take a project from initial brief through to a fully-resolved, fully-compliant system specification — with every loudspeaker position, cable route, amplifier zone and operator interface considered, calculated and documented.
Every design is engineered to the relevant code — BS 5839-8:2023 for voice alarm, BS EN 50849 for non-fire emergency systems, and the Network Rail standards stack for rail projects — with EASE acoustic modelling and STIPA intelligibility verification built into the workflow from day one.
What We Deliver
Full topology diagrams showing controllers, amplifiers, loudspeaker circuits, microphones, network switches and integration points — with redundancy paths and degraded-mode behaviour clearly defined.
Full 3D EASE AURA models constructed from architectural data — loudspeaker positioning, SPL coverage maps, and STI predictions across the listening area before a single device is mounted.
Full schematic drawing set in AutoCAD or Revit — floor plans showing every device, zone-by-zone elevation drawings, and rack layouts to scale.
Comprehensive cable schedules with type, gauge, length, route, and termination at each end — supporting accurate quantity surveys and a compliant install.
EN 54-4 standby capacity calculation showing quiescent and alarm current draw, required battery Ah, and charger sizing — ready for design submission.
Full cause-and-effect mapping for every fire-detection input, every evacuation message, and every zone — signed off with the fire engineer before commissioning begins.
Design Process
Site visit, fire-strategy review, capture of architectural drawings, BMS / fire-alarm interface points and any client-specific operational requirements.
Topology, zoning, equipment selection, EASE acoustic model. Issued to client and fire engineer for review, with revisions captured before detailed work begins.
Schematics, cable schedules, rack layouts, power calculations, BoM, cause-and-effect matrix — full design submission package issued for approval.
Coordination with installer and fire-strategy author, sign-off, and issue of construction drawings — with version control maintained throughout the project.
Standards Framework
Voice Alarm & PA
- BS 5839-8:2023 — VA design code of practice
- EN 54-16 — Voice alarm control equipment
- EN 54-4 — Power supply equipment
- EN 54-24 — Loudspeakers for fire
- BS EN 50849:2017 — Non-fire emergency sound
- BS EN 60268-16:2020 — Speech transmission index
Rail & Sector-Specific
- NR/L2/TEL/30134 — PA / VA / LLPA design
- NR/GN/TEL/30137 — Loudspeaker selection
- NR/L2/RSE/0005 — Product reliability
- BS 7827 — Sports venue emergency sound
- BS 6259 — Sound system code of practice
- Equality Act 2010 — Hearing-loop accessibility