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 systems 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 variety of detector testers for this very purpose – to test just how clear and easy-to-understand your emergency voice system is.



The VOX VOX01 is a universal, easy to use speech intelligibility tester for your fire safety system.

The VOX01 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.

The VOX01 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

Make sure you have an accurate tester for your system. Speech Intelligibility Testers, like Vox, are an integral part of fire safety and alarm system.


Along with the VOX01, SDi Fire also offers the VOXBOX. The VOXBOX acts as a complement to our detector testers by allowing you to test for yourself the speech intelligibility of your alarm system. Like the VOX01, the VOXBOX is designed for your ease-of-use, with a simple and efficient design and a clean and clear interface.

Other details include:

  • Loudspeaker frequency range 20 – 15,000 Hz
  • Plays back signal at a standardized (calibrated) signal level of 54-72 dB(A) @ 1m
  • Signal level can be increased/decreased relative to environment
  • Powered through external power supply, which comes included.

Detector Testers from SDi Fire

With VOX01 and the VOXBOX, you can make sure, thanks to SDi Fire, that your fire safety system is working to industry standards, keeping you, your staff and your property safe in the event of a fire. If you would like to place an order or have any questions about our products, you can contact SDi Fire today. Alternatively, feel free to take a look at our other fire safety products.