The sound masking’s uniformity affects how noticeable it is to the occupants. Variations of more than 1 to 2 dBA can call attention to the sound and also reveal its source. Uniformity is determined by the location of the loudspeakers, the spacing between them, and the degree of frequency and volume adjustment the system offers.

Ask what range of variation the sound masking system’s specifications permit.

If the sound masking system is installed within the ceiling, also ask whether the loudspeakers will be upward- or downward-facing. Downward-facing loudspeakers, such as those used in ceiling tile sound masking systems, can be prone to significant volume variations due to a ‘spotlight’ effect. A decentralized sound masking system installed above the ceiling tiles can easily be adjusted to account for any obstructions within the plenum.