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Checking Noise Masking with XL2 Spectral Limits

I had a request from a XL2 customer looking to verify a sound masking installation. I created this document to step them through setting up the mask and performing the test.

There are many applications for sound masking systems:

  • Open plan offices are gaining in popularity
  • Speech privacy in medical offices under the Health Insurance Portability and Accountability Act (HIPPA)
  • A better night’s sleep in a hotel by masking out noises from other guests or hotel operations

The installed space is part of the sound masking system. Each installation has a unique floor plan; absorption of floor, walls and ceiling; and limited locations to install sound masking speakers.

Good practice is to verify operation of a sound masking system. Typically, the manufacturer of the system specifies the spectrum of the masking noise. The masking noise spectrum varies from location to location as a function of distance from speakers and the characteristics of the immediate space (e.g. in a hotel room, the bathroom is highly reflective while the sleeping area is absorptive)

The NTi Audio XL2 Audio Analyzer with the Spectral Limits Option is a powerful, handheld system for checking and documenting the installed performance of sound masking systems.

The attached document steps you through creating a limits or masks for testing sound masking system. At the end it references locations of additional information like pages in the XL2 User Manual and other instructions.


Hi...I do not have the sound and vibration tool kit nor do I believe I need them being in the Satellite/RF test industry. This is the second time I had to perform spectral mask testing and each time it is suggested to use the before mentioned VIs that come with Labview and I can never get them to work. Every example I find is using the time domain. One of the biggest problems I am seeing especially with the Mask and Limit Testing express VI is that it is not plotting the frequency points correctly or the power points.

Sorry for the delay.

I think you are confusing this company "NTI Audio" with NI, National Instruments. It sounds like you have NI's LabView product. Please try

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