Law Firm Office Speech Privacy and Sound Masking System by Cambridge

This law firm and attorney office sound masking system will ensure speech privacy for legal interviews, conferences, client depositions and conversations between clients and their counsel. Protect your clients’ rights to confidentiality and increase their comfort when discussing legal matters.

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Sound Masking for Legal Environments

Increase confidentiality and comfort when discussing legal matters with this speech privacy sound masking system. Provide privacy for interview rooms, client depositions, conversations between clients and their counsel and public corridors to protect clients’ rights and allowing victims and witnesses to give full statements confidentially. Help make client depositions and legal counsel between clients and their attorney unintelligible to others. Reduce distractions in law offices from unwanted noise and conversations while improving worker performance and productivity.

This easy to install speech privacy system comes with 12 small emitters that are barely visible, making them fit any decor in law firm offices, law enforcement agencies, courtrooms or any legal environment.

Keep Private Meetings Private

The Qt Conference Room Edition from Cambridge Sound Management is a cost-effective solution specifically designed to protect the speech privacy of conversations in conference and board rooms.

All-in-One Solution for Conference Room Privacy

The Qt Conference Room Edition consists of a control module, two lighted privacy signs, and 12 direct-field sound masking emitters. When a room occupant turns on the control module inside of the room, it powers the sound masking emitters placed in the ceiling. The emitters add a low level of background sound making human speech less intelligible. Lighted privacy signs indicate the system is running, and let room occupants know their conversations are being protected. The entire system is GreenSpec listed, consuming less than 7 watts of power. The Qt Conference Room system can be turned on and off as needed - or left running at all times.

Easy to Retrofit into Existing Spaces

Often overlooked in conference room design and construction is the potential for private conversations to travel easily under, over, or even through walls and doors. In fact, according to a recent study, fifty-three percent of support staff workers have overheard confidential conversations at work. Install the Qt Conference Room Edition today to ensure your private meetings remain private. Privacy signs can be surface mounted, glass mounted, or mounted into a gang box, easily blending in with modern office decor.



  • Sleek and modern design
  • Delivers high performance speech privacy protection by projecting masking from the ceiling
  • Easy to Use, the LCD screen clearly displays the current status, providing worry-free control
  • Equipped with two automatically lighted privacy signs
  • Can be turned on and off as needed for meetings - or left running at all times
  • GreenSpec listed and the most energy efficient speech protection system available
  • Consumes less than 7 watts of power
  • Installed in minutes, surface mounted, glass mounted, or mounted into a gang box
  • Reduces the need for expensive conference room construction or sound blocking material
  • Powered by direct-field Quiet Technology, developed to make speech unintelligible to unwanted listeners
  • Reduces the need for expensive conference room construction or sound blocking material
  • Easily installed and retrofitted in existing conference rooms
  • Qt Emitters placed outside the conference room can be installed in minutes - and in any ceiling type
Control Processor/Privacy Signage
Sound Masking Frequency Response 200 Hz -6,300 Hz
Music / Paging Frequency Response 200 Hz to 10,000 Hz
Masking Min - Max SPL 30 dBA to 60 dBA @ 1 meter distance
Music / Paging Max SPL 62 dBA @ 1 meter distance
User Adjustable Equalization None - Internally Fixed Masking Spectrum
Non Correlated Masking Sources 4 Masking Sources
Number of Masking Zones 1 Zone - (2 Cable Runs per Zone)
Number of Audio Inputs 1 Audio Input - (Stereo or Mono)
Audio Input Level +4 dBu (2 Volts RMS Max)
Audio Input Impedance 5000 Ω
Audio Input Connector Captive Screw Terminal (Balanced / Unbalanced)
Remote Control Function Quantity 1 - Contact Closure Input (Normally Open) / Qty 1 - 5Vdc Logic Status Output
Remote Control Connector Captive Screw Terminals
Minimum Output Impedance 7Ω per channel
Power Input Captive Screw Terminal & Coax Power Plug (center pin positive)
Privacy Sign Connections Controller Qty 2 - Captive Screw Terminals - 5Vdc Output @75ma (confirm sign power draw)
Privacy Sign Connections Sign Qty 1 - Spring Loaded Push Terminals - 5 Vdc input @ 75ma current draw
Output Connections RJ45 x Quantity 2 (8 Conductor)
Masking Level Adjustment Four Front Panel Buttons w/ LCD Display - 0.5 dB steps
Masking Ramp Times 0 to 120 Seconds - up and down ramp times are independent (Front Panel / Remote Control)
Audio Input Level Adjustment Four Front Panel Buttons w/ LCD Display - 1 dB steps
Setup Menu Access Four Front Panel Buttons w/ LCD Display
Emitter / Device Capacity 60 Qt Emitters per Run - 120 Qt Emitters Total
Maximum Emitter Cabling Distance 1000ft (300 meters) per cable run
Maximum Power Consumption 7 Watts @ 24 VDC
Power Supply Operating Voltage Input: 100 - 240 VAC @ .6 Amp
Output: 24 VDC @ 1.0 Amp
Included Control Processor Accessories Power Supply / ACT Hole Saw / Box Adapter Plate (4-Gang US - 3- Gang UK/EU) / ST-1000 Back Box
Included Privacy Sign Accessories Qty 2 - Single Gang Electrical Enclosure Backing Plate / Qty 2 - Glass Finishing Plate with Adhesive Strips
Firmware Update Yes - Integrated USB Connector
Controller Mounting Wall Mount - (Back plate included) / Electrical Box (US/UK/EU Adapter Included) / Supplied Backbox
Privacy Sign Mounting Single Gang Electrical Enclosure (North American Nema or EU/UK types) / Self Adhesive Strips
Control Processor Color Black
Privacy Sign Color Black w/ Blue LED
Operating Temperature Range 40°F to 90°F (4°C to 32°C)
Certifications FCC Part 15 RoHS Compliant CE US STD 60065 CAN/CSA STC C22 2 60065 ETL Listed Green Spec Listed
Privacy Sign Dimensions (H x W x D) 0.19" (4.826 mm) x 3.5" (88.9 mm) x 4.5" (114 mm)
Control Processor Dimensions (H x W x D) 0.875.0" (22.2 mm) x 7.0" (177.8 mm) x 3.5" (88.9 mm)
Weight Control Module: 0.7 lbs (300 g)
Privacy Signs: 0.1 lbs (50 g)
Sound Masking Frequency Response 200 Hz - 10,000 Hz
Music / Paging Frequency Response 200 Hz - 10,000 Hz (-10 dB)
Masking Min - Max SPL 30 dBA - 60 dBA @ 1 meter distance
Music / Paging Max SPL 62 dBA @ 1 meter distance
Nominal Impedance 3600 Ω
Nominal Dispersion 170 degrees conical / half space
Connections Input / Output - RJ45 Modular Jack
Channel Selection Four Channel Auto Sequencing and Repeating
Selectable Attenuation 0 dB, -3 dB, -6 dB, -9 dB
Cabling Category UTP Cabling (8 conductor)
Included Accessories Acoustic Ceiling Tile Mounting Ring - UTP Cable (16ft/30ft)
Loudspeaker Type Passive w/ Transformer
Maximum Power Consumption .110 Watts
Privacy Sign Cabling Type CMP (Plenum) 20AWG 2 Conductor Cable
Enclosure Sealed
Color White (Optional Black Caps and Accessories)
Certifications UL 2043
Cabling Qty 1 - 50ft Emitter Cable / Qty 7 -16ft Emitter Cables / Qty 2 - 50ft Privacy Sign Cables - Included in Kit
Emitter Cabling Type CMP (Plenum) UTP Twisted Category 3 Cable
Driver Dimensions (Dia) 1.25" (32 mm)
Emitter Dimensions (H x Dia) 2.5" (64 mm) x 3.25" (83 mm)
Weight 0.35 lbs (0.159 kg)


In The Box

In The Box

  • (8) Qt Emitters
    • plus (4) Additional Qt® Emitters
  • (1) Wall-Mounted ST 1000 Control Module
  • (1) 4-Gang Adaptor Plate for Control Module
  • (2) Automatically Lighted Privacy Signs
  • (2) 1-Gang Adaptor Plates for Privacy Signs
  • (2) 50 ft (15.2 m) Plenum-Rated Cables for Privacy Signs
  • (1) Power Supply
  • (7) 16 ft (4.8 m) Audio Cables
  • (1) 50 ft (15.2 m) Homerun Audio Cable
  • (1) Hole Saw

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