Tuning a sound masking system on four new floors at a building in downtown Dallas. PPE is required for active construction, it is not a fashion statement. System is AtlasIED DSP/amps/speakers using AKG omni calibrated mic w/ MOTU PC interface and REW RTA software. System is designed to prevent others from hearing conversations nearby.
The masking system is tuned to an industry standard frequency roll off designed to sound pleasing and unobtrusive. The overall level is set to about 47 dBA.
Attenuators are provided to adjust levels for groups of speakers to provide more granule calibration.
Speakers are hung in the plenum space above the drop tile ceiling in an upward facing position. The speakers are typically spaced about 15′ apart depending on ceiling height, plenum depth and ceiling type. Normally the speakers are part of a 70 volt system. The speakers are tapped at 1 watt but may tap higher or lower to even out the SPL within a specified area.