It is important to understand the curve defines

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A sound masking spectrum
A sound masking spectrum—often called a ‘curve’—is engineered to balance effective acoustic control and comfort. It is usually provided by an acoustician or an independent party such as the National Research Council (NRC), rather than by the masking vendor. Though a masking curve includes a wide range of randomly generated frequencies, it is narrower than the full audible range—typically from at least 100 to 5000 Hz, though sometimes as high as 10,000 Hz. Further, the volume of masking frequencies is not equal, and does not decrease at a constant rate as frequency increases.

what the system’s measured output should be within the space. Regardless of how the system is designed, its ‘out-of-the-box’ settings, the size of its zones, or the orientation of its loudspeakers (i.e. upward- or whatsapp number database downward-facing, sometimes called ‘direct-field’), the sound is influenced as it interacts with elements of the workplace interior, such as the layout, furnishings, and other variables. Therefore, in order for the sound to actually meet the desired masking curve, the system’s volume and frequency settings have to be adjusted. In other words, it must be tuned for the particular environment in which it is installed.

Tuning is handled by a qualified technician after the ceilings and all furnishings are in place, and with mechanical systems operating at normal daytime levels. Since conversations and activities can prevent accurate measurement, it is done prior to occupation or after hours. The technician uses a sound level meter to measure the masking sound at ear height. They analyze the results and adjust the system’s volume and equalizer controls accordingly. This process is repeated as often as needed until they meet the curve at each tuning location.