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Low Frequency Sounder, Sounder/Strobes

System Sensor low Frequency Sounders and Sounder Strobes meet the NFPA 72®2010/2013 low frequency requirements effective January 1, 2014 for all commercial and certain residential sleeping spaces. Studies driving these requirements have shown that a lower frequency is more effective at waking individuals in a fire event, including those with mild to severe hearing loss.
L-Series Speakers are 520 Hz capable with compatible FACP.

Features & Benefits:

  • 520 Hz ± 10% square wave tone
  • Plug-in design with minimal intrusion into the back box
  • LF Sounder Strobe field-selectable candela settings on wall: 15- 185cd, Speaker Strobes have full range 15-185cd
  • Rotary switch for low frequency sounder tone: Temp 3 or Temp 4
  • Mounting plate shorting spring checks wiring continuity before device installation
  • Low Frequency Sounder listed for ceiling or wall mounting
  • Round (Ceiling)Low Frequency Sounder Strobe listed for ceiling or wall mounting


  • Standard Operating Temperature 32°F to 120°F (0°C to 49°C)
  • Humidity Range 10 to 93% non-condensing
  • Frequency Range 520 Hz ± 10%
  • Strobe Flash Rate 1 flash per second
  • Nominal Voltage Regulated 12VDC or regulated 24DC/FWR1
  • LF Sounders and Sounder/Strobes Operating Voltage Range 16 to 33V (24V nominal)
  • Speaker Operating Voltage Range 25 and 70V (nominal)
  • Electrically compatible with System Sensor Sync Circuit listed to UL 464
  • Compatible with previous designs dating back to 1997
  • Input terminal wire gauge 12 to 18 AWG


  • UL
  • FM
  • CSFM


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