Soft dB CMS-II Small Office Sound Masking Controller

Item No. CMS-II

The CMS-II is a full-featured sound masking system on its own, specially tailored for small offices below 5000 ft2. This standalone controller delivers Soft dB’s renowned sound masking performance straight out of the box, no calibration needed.


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  • Each CMS-II provides:
    •  Touch-screen user interface
    • 1 or 2 speaker outputs (zones)
    • Up to 12 speakers per zone
    • Independent settings for each zone
    • Volume adjustment
    • Bass/treble adjustment
    • 12 pre-set equalizers to fit the sound environment
    • Adjustable ramp-up period.
    • Music/Paging:
    • Paging trigger to lower sound masking volume while paging
    • Emergency mute relay • 2-Level pass code locking
    • Versatile enclosure with multiple configurations:
    • Desktop • Wall-Mount
    • Flush-Mount

The CMS-II works with the complete range of Soft dB sound masking speakers therefore allowing this compact system to be installed in virtually any office type: open-plan offices, private offices, and meeting rooms with suspended ceilings, exposed ceilings, radian metal ceilings, raised access floors, etc.



Speaker Outputs:

  • Nb Outputs (Zones): 1
  • Max Nb Speakers/Output: 12
  • Connector: 2-pos. screw terminal

Sound Masking

  • Volume: ±10 dB with respect to selected pre-set equalizer
  • Equalizer: 12 pre-set equalizers with ±10 dB gain and ±5 dB Bass/Treble to fine-tune sound masking
  • Volume Ramp-Up: User defined, 1day to 4 weeks

Music and Paging

  • Input: 1 (Stereo, ±1.5V range)
  • Connector: 3-pos. screw terminal (Left, Gnd, Right)
  • Mixer: Independent for each zone
  • Volume: 0-100% in 1% step
  • Equalizer: ±5dB Bass/Treble

Emergency Mute Relay

  • Input: 1
  • Connector: 2-pos. screw terminal, isolated
  • Function: Mute sound masking (and music/paging if required), for UL2572 compliance


  • Rated Power: 25W
  • Operating Voltage: 24V
  • Connectivity: Barrel connector or 2-pos. screw terminal for wall-mount configuration


  • Size: 168mm x 124mm x 47mm (6 5/8” x 4 7/8” x 1 13/16”)
  • Weight: 450g (1.0lb)
  • Mounting Configuration: Desktop, Wall-mount (with built-in key-holes), or Flush-mount*


  • Warranty: 5 years


  • UL 62368– Standard for Audio, Video and Similar Electronic Apparatus – Safety Requirements
  • FCC – EN 55103-1&2 – Electromagnetic compatibility-Product family standard for audio, video, audio-visual and entertainment lighting control apparatus for professional use – Part 1: Emissions, Part 2: Immunity

Related ASTM Standards

  • ASTM E1374-06 (11) – Standard Guide for Open Office Acoustics and Applicable ASTM Standards
  • ASTM E1573-09 – Standard Test Method for Evaluating Masking Sound in Open Office Using A-Weighted and One-Third Octave Band Sound Pressure Levels
  • ASTM E1130-08 – Standard Test Method for Objective Measurement of Speech Privacy in Open Offices Using Articulation Index
  • ASTM E2638 – Standard Test Method for Objective Measurement of Speech Privacy Provide by Closed Rooms

*Can be installed directly in the wall or using a 3-Gang NEMA device box

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