Office Sound Masking System Small to Medium Multi-Zone with Cambridge Sound Management QT 300 and 24 Emitters (3 Zones up to 36,000sf 360 Emitters)
Part # SMSS-QT300OS
Model # SMSS-QT300OS

The Cambridge Qt 300OS Office Sound Masking System is a highly cost effective, fully integrated sound masking solution to protect speech privacy and reduce distractions for any office space, from single floor, multi-zone installations to large multi-building offices.

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The SMSS-QT300OS Office Sound Masking System provides precise control over where the masking sound is emitted. This means that sound masking is dispersed only in the spaces in which it is needed, eliminating unwanted spill over into adjacent spaces. The system provides a uniform blanket of sound coverage throughout the work space and is unaffected by ceiling design and the many obstructions that often litter the plenum. The sound is transmitted as four uncorrelated channels, creating a more pleasant and comfortable masking sound.

The Qt® 300 is ideal for medium multi-zone spaces of up to 36,000 square feet (3,345 m2). This system is capable of covering up to 3 diverse areas in buildings needing improved speech privacy.

This robust and feature-rich system is easy to control and maintain. Users can adjust system settings via the easy-interface front panel, and can also set up error reporting and establish time dependent masking levels via their PC, Mac or tablet device using the intuitive Qt® Monitoring and Control Software. Additionally, the Qt 300 is an integrated solution offering sound masking along with paging and music via the two auxiliary audio inputs.

Qt emitters™ can be installed into any office space, no matter what type of ceiling is present. The system is designed to grow and change with your business. Qt emitters can be moved and reconfigured with minimal effort and impact when your work space changes. In new construction or in existing space, emitters can be installed rapidly and with low impact to the surroundings and little to no down-time for the business.

Each Qt system comes pre-tuned, specifically calibrated to efficiently mask the frequencies most commonly associated with the human voice.

Qt Quiet Technology meets:

The ASTM E1130-08 standard for “Normal Acoustic Privacy” by providing an Articulation Index below 0.2 or Privacy Index above 80%. The system meets this privacy standard at up to a 3 dBA lower noise level than competing sound masking systems.
The DCID 6/9 Requirements for helping organizations reach a Speech Transmission Coefficient (STC) of 45 or better (sound groups 3 & 4) to secure verbal communications in Government and Military installations.



  • 2 Audio Inputs for Music/Paging
  • 3 Zones
  • Maximum Number of Emitters: 360
  • LCD Control Panel with Network Connection
  • Trusted by over 15,000 companies
  • GreenSpec listed and enables LEED certification
  • Powered by direct-field Quiet Technology, developed by acousticians to reduce acoustic interference
  • Delivers uniform sound masking by projecting from not through the ceiling
  • Reduces the need for expensive construction or sound blocking material
  • Emitters can be installed in minutes and in any ceiling type
  • The only sound masking system than can be easily installed in existing space (retrofit)
  • GreenSpec listed and the most energy efficient sound masking system available
  • Reduces distractions and improves productivity in open office spaces
  • Improves confidential speech privacy in private offices
  • Achieves spatial uniformity in open offices using four channels of uncorrelated sound
  • Requires no post-installation tuning
  • Integrated aux audio input supports paging or music distribution
  • Input may be from PBX, paging microphone or any standard audio source
  • Input connection via 3-pin terminal connector; balanced or unbalanced input with 40K Ohm input impedance line level input (6V max)
System Includes

System Includes

  • (1) Cambridge Qt-300 Sound Masking Generator
  • (24) Cambridge Qt Emitters Sound Masking Speakers
  • 16ft Cable per 4 Emitters

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