Electronic multifunction alarm siren
109 dB(A) · 300 W · 2 horns
Alarm sirens
EWSA electronic sirens
Sirens for alarm signalling and voice communication in public warning systems. High-efficiency aluminium alloy horns, built for harsh conditions and operation from −50 °C.
Model comparison
| EWSA-2 | EWSA-4 | EWSA-6 | EWSA-12 | |
|---|---|---|---|---|
| Directional level (30 m) | 109 dB(A) | 118 dB(A) | 112 dB(A) | 124 dB(A) |
| Back-to-back level (30 m) | 103 dB(A) | 109 dB(A) | 115 dB(A) | 118 dB(A) |
| Horns | 2 | 4 | 6 | 12 |
| Amplifier power | 300 W | 600 W | 900 W | 1800 W |
| Batteries | 2 × 12 V 24 Ah | 2 × 12 V 38 Ah | 2 × 12 V 38 Ah | 2 × 12 V 75 Ah |
| Standby without mains | > 10 days | > 10 days | > 30 days | > 10 days |
| Horn array weight | 19 kg | 38 kg | 58 kg | 118 kg |
| Frequency response | 200–10 000 Hz | 200–10 000 Hz | 200–7000 Hz | 200–10 000 Hz |
Siren sizing calculator
Approximate number of sirens needed to cover an area with at least 65 dB(A).
The result is an estimate based on datasheet curves and an ideal layout. A system design takes terrain, mounting height and background noise into account.
Request a design for your areaCommon to the EWSA family
- Alarm signals
- civil defence signals, fire alarm, 5-second alarm, programmable signals
- Voice messages
- live from a remote or local microphone, stored messages
- Remote control
- analogue and digital VHF/UHF radio, LAN, cable, optional GSM
- Local control
- keypad or button, EWSA-K1 local unit
- Backup power
- maintenance-free batteries, more than 10 days of standby without mains
- Integration
- RS-485, works with the MCA control centre in the SAOL system
Planning a warning system?
Let’s talkSiren and control selection, design and a quote — including for public tenders.