Achieving the expected results
It’s important to note that not all sound masking systems can produce the required minimum frequency spectrum of 100 Hz to 5 kHz because their loudspeakers (or emitters) are simply too small to achieve the lower frequencies required for occupant comfort and to mask a wider range of noises.
Furthermore, in order verify a sound masking system’s output per ASTM 1573-18, Standard Test Method for Measurement and Reporting of Masking Sound Levels Using A-Weighted and One-Third-Octave-Band Sound Pressure Levels (or equivalent), the system’s control zones must – at minimum – align with the standard’s maximum test areas, which require the masking sound to be measured within each 1000 ft2 of open plan space and each closed room individually.
If your sound masking system’s design isn’t aligned with these criteria, it’s unlikely the sound it ultimately produces within your space will meet the specified tolerances within each test area – that is, if you’re also working with a strong sound masking specification, as ASTM 1573-18 only provides a procedure to quantify the uniformity of the sound, not the acceptable degree of uniformity.
Uniformity is key to a successful masking outcome because it impacts how well the sound improves occupants’ speech privacy and acoustical comfort throughout all treated areas; in other words, how well the sound masking system performs its intended role. That’s why a strong sound masking spec not only indicates the degree of variation permitted in overall volume and each third-octave band, but also demands tight tolerances. A poorly designed or improperly tuned sound masking system – or one based on loose specs – can allow as much as 4 to 6 dBA variation, meaning the system’s effectiveness would be halved in unpredictable areas within your facility.
With its small zones, full-range loudspeakers and unique TARGET-tuning feature, the LogiSon Acoustic Network is well-equipped to provide occupants with comfortable, consistent and effective masking sound. LogiSon Representatives also have the technical expertise and specialized equipment (i.e., ANSI Type 1 one-third octave analyzers and Class 1 calibrators) required for precise field tuning.