Self-contained plenum soundmasking system is designed for quick and easy installation into small office It is best utilized when areas of under 200square ft require dedicated control. Units can be suspended from above or bridge-mounted above ceiling tile grid, making it ideal for flex-space and open structure applications. It is also suited for use when HIPAA oral privacy mandates are concern (check-in, examination, consultation, and pharmacy areas). Multiple units can be wired together powered by central, class two transformer. It contains soundmasking source, low pass filter, soundmasking amplifier, and an 8-inch diameter loudspeaker. These are enclosed in 300 cubic inch acoustically dampened enclosure. The unit’s easily accessible, dedicated volume and tone control allow unit to be fine-tuned. It comes completely assembled and ready for easy installation. The connection points are pushed back into enclosure and strain reliever screws are tightened to form both strain relief and wire protection.