Speech Intelligibility Testing

Fire safety should never be taken for granted, no matter what kind of business you run or how big your location (or multiple locations) are. Having an effective, accurate fire safety system is vital, and you need a reliable way to make sure that it works. You also need to know that your system’s voice is clear and easily understood, making sure that all your staff at your location are able to hear and understand it when time and safety is a factor. SDi Fire offers a speech intelligibility testing solution for this very purpose – to test just how clear and easy-to-understand your emergency voice system is.

Bedrock SM50

The Bedrock SM50 is a universal, easy to use speech intelligibility tester for your fire safety system. The SM50 is designed primarily for ease-of-use, with a simple, user-friendly touch screen for precise and basic control. The unit is also equipped with a USB port to provide fast and versatile connectivity to your network. Additionally, the unit includes a custom hard case for its own protection, making sure it is kept safe and in working condition.

  • Easy to use touch screen
  • USB port
  • Includes custom hard case
  • Also includes features such as RTA, FFT, Reverberation Time, Noise Curves, and much more
  • Capable of taking both STIPA and full STI measurements
  • Unit conforms to the IEC651 Type 2, ANSI S1.4 Type 2
  • Type 2 / class 2 Sound Level Meter (fast, slow, A/C, Z-weighting)
  • Complies with NFPA 72 – 2013, ANNEX D


BTB65 Talkbox

Along with the SM50, we also offer the BTB65 Talkbox. The Talkbox is a calibrated acoustic signal source for taking STIPA measurements and more. It can play test signals through its built-in loudspeaker, or you can use the line-out feature to play the test signals through other devices.

  • Easy to use touch screen
  • Loudspeaker frequency range 20 – 15,000 Hz
  • Plays back signal at a standardized (calibrated) signal level of 54-72 dB(A) at 1m
  • Signal level can be increased/decreased relative to environment
  • Powered through external power supply (included)
  • Includes custom hard case
  • Can be purchased with the SM50 as a bundle or as a standalone unit.