CommunicationsPublic Address System
IP or 100V paging and background music for factories, schools, hotels and sites, with zoned emergency announcements.
What we usually find on site
On big plants and sites, announcements and evacuation orders still go out by radio or one phone call at a time: slow, and people get missed. The old speakers distort so badly nobody can follow them, and there are no zones, so calling one forklift driver means paging the entire plant.
IP or 100V?
| Traditional 100V line | IP PA | |
|---|---|---|
| Cabling | Speaker cable, runs long distances well | Uses existing LAN/PoE |
| Zones | Limited by matrix/amplifiers | Scales widely |
| IP-PBX link | Needs an interface | Direct SIP integration |
| Best for | Factories, large outdoor areas | Well-networked, multi-building campuses |
Most projects we do end up hybrid: IP for control and zoning, 100V for outdoor horn speakers.
Designed to be heard
Rule of thumb: announcements should sit about 10 dB above background noise. In a plant where machinery runs at 85 dB, that means enough horn speakers placed close enough, not one big speaker turned up to maximum. We measure actual noise, calculate speaker count and placement, and specify IP-rated, rain- and dust-proof speakers for outdoor and mine areas. Long outdoor speaker runs also need lightning protection.
Emergency paging
Linked to the fire alarm panel, the system mutes music and broadcasts evacuation messages to the affected zones automatically. Where the project calls for a certified voice-alarm system (e.g. EN 54-16), we specify compliant equipment to that specification.
Send us the plant or building layout and we will mark out zones and speaker positions.
What it does
Zoned paging
Page one building, floor or area.
Background music
Per-zone music with volume control.
Scheduled announcements
Automatic shift change, lunch break and school bells.
Fire alarm interface
Automatic evacuation messages when the fire panel triggers.
Paging from phones
Dial a code from any IP phone to page.
Rugged speakers
Rain- and dust-rated horns for outdoor use.
Design and rollout
- 1
Survey areas, measure ambient noise and define zones.
- 2
Choose IP, 100V or hybrid and calculate speakers and amplifier power.
- 3
Install cabling, speakers, amplifiers and paging stations.
- 4
Integrate with fire alarm and IP-PBX.
- 5
Tune, test speech intelligibility zone by zone and train operators.
Where it fits
- Factories and mine sites needing safety and evacuation paging.
- Schools needing automatic bells and per-building announcements.
- Hotels and malls with zoned background music.
- Warehouses and dry ports paging staff.
Typical system sizes
Building
Fits: Single building, up to 8 zones
- Amplifiers and ceiling speakers
- Paging mic and background music
- Bell scheduling
Campus / Industrial
Fits: Multi-building or industrial site
- Multi-zone IP or hybrid PA
- Rain- and dust-rated horns
- Fire alarm and IP-PBX integration
Brands we supply & install
All brand names and trademarks belong to their respective owners. Mention does not imply official partnership unless explicitly stated. Products are sourced through legitimate distribution channels.
FAQ
Can we reuse existing speaker cabling?
If it is a 100V system in decent condition, often yes. We measure impedance and test for earth faults first, because rat-chewed or water-damaged cable is common in older buildings.
Can PA replace a fire alarm?
No. PA adds announcements; detection and alarm must come from a dedicated fire alarm system.
Can we page from a mobile phone?
Yes, with IP PA connected by SIP to the IP-PBX, using a softphone that has paging rights.
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We’ll come back with a few questions, then a first design. The first consultation is free, in Lao, Thai or English, on WhatsApp or our Facebook page.