VSO Sounder

Product Overview

The VSO ceiling mount base sounder is part of the Vantage family of products and has been designed for fire alarm system applications. The VSO base sounder is for use with conventional fire alarm systems and is designed to accept all Ampac detector bases while offering a cost effective solution to sounder installation.

The sounder function, like all the Vantage family of products, is a low profile sounder with 32 selectable tones as standard and is factory set to the Australian compliant AS4428-16 tone. The sounder has the option of a changeover facility from Alert to Evacuate tone, when installed using 3 core cable.

All tones have been selected to comply with latest sound patterns and frequencies used throughout the world. All tones are fully synchronised.

When a detector is not being mounted to the sounder a blank cover plate is available so that the unit can be used as a standalone sounder.

Refer tone table for full list of available tones.


  • 32 selectable sounder tones 
  • Switch selectable volume output levels
  • Modem ultra-low profile for discreet mounting
  • Designed to accept most leading detector bases
  • Two colour options
  • Designed to work with conventional alarm circuits
  • Synchronisation between devices
  • AS4428-16:2015 compliant tones


Volume settings

3 – high, medium & low


18 to 30Vdc

Current at Vmax (30 Vdc)

13mA high, 8mA med, 6mA low

Current at Vmin (21 Vdc)

10mA high, 5mA med, 4mA low

Sound output typical

Max 90.9dB (high)

Sound pattern (Evacuate)


Sound pressure (Alert)

520Hz +/- 5% on a temporal 3 pattern (ISO8201)

520Hz +/- 5%, 1 pulse of tone for 0.5 seconds followed by 3.5 seconds of silence (ISO7731)

Number of tones

32 (refer tone table)

Temperature range (°C)

-20°C to + 70°C


Reverse polarity

Protection rating

IP21C (shallow body)


Ø 20mm x 20mm D

Boxed weight (kg)


Body colour

White or Ivory

(ABS fire retardant plastic)

Sounder type

Type A



Item Numbers

4107-3005 VSO Sounder White Body
4107-3006 VSO Sounder Ivory Body
4107-3008 VSO White Sounder Cover Plate