The Stealth Sound Barrier

The Total Speech Protection and Audio Jamming System

The Stealth Sound Barrier provides the total protection against:

  • Digital and tape voice recorders
  • Voice recorders built-in cellular phones
  • Laser Monitoring Device
  • Wired and wireless microphones
  • Stethoscopes, etc.


The Stealth Sound Barrier is the most advanced and unique system to provide total protection for human’s speech. Not all listening devices can be detected by existing methods. Remotely controlled radio microphones, wired microphones, passive resonators, miniature voice recorders – practically all these devices cannot be detected by the conventional methods. Even a modern cellular phone may contain a digital voice recorder; this means that any phone lying on the desktop or in a pocket could be used by an adversary to record a conversation or transmitting any acoustic information.

Bearing the above points in mind, it is extremely important to have a reliable device protecting private conversations not depending on their level of importance. The concept of The Stealth Sound Barrier is based on generating audio interference produced simultaneously with a human’s speech. The volume of this interference is higher than the level of a person’s voice; therefore neither a listening device nor a recorder is able to pick it up the actual human speech.

The unique audio interferencecannot be cleared by any noise-clearance methods. At the same time the produced interference does not create any inconvenience to the participants of the negotiation who wearing to the headsets connected to it. The Stealth Sound Barrier headset allows users to hear each other with crystal quality.

It combines the features of our unique speech protection system, Druid-D06, and a professional electric white noise generator, DNG-2300, to provide the perfect protection of human speech to prevent eavesdropping activities and the third person listening. The two main units work individually or simultaneously with the mixed acoustic interference for increasing the effect..


The communication unit generates special scrambled audio interference which cannot be cleared by any noise-clearance methods simultaneously with the human speech and allows only the users with headsets or headphone and microphone through its communication ports communicate clearly. Even a recorder carried by a participant of the conversation or a third person near the participants can not pick up the actual conversation.


The digital white noise generation unit can be use as a standard white noise generator with transducers and Omni-speakers and can mix with the scrambled audio interference from communication unit to provide more secured sound barrier around the room.


The Stealth Sound Barrier system can be installed in the audio system rack in the conference room or in any portable rack for mobility. It can be customized to provide the perfect solution for any environment and purpose.


  • Professional system for protecting speech between up to 24 people (Standard). – Can be added more users by 24
  • Protects against any third person listening and all known methods of listening, including all types of radio microphones, stethoscopes, voice recorders, passive resonators, wired microphones, etc.
  • Absolutely harmless to your health – no microwave reflections or ultrahigh sound noise
  • Compared to a white-noise generator, The Stealth Sound Barrier provides a much higher level of protection; Acoustical white noise does not jam digital voice recorders completely even at a high volume, and the users must bear the inconvenient white noise too.
  • The system can be installed in any standard 19” Rack with the audio system in a conference room or in a Portable Rack for easy transference. it can be customized for any purpose.
  • Powered byAC 110~220 V
  • The system can be used in any situation; it is especially valuable when conducting highly important negotiations in an unknown environment;
  • Can be used the digital noise generator function only to prevent listening though devices that cannot be detected by conventional countermeasures and installed around the perimeter of a room – wired wall microphones, contact microphones, AC outlet transmitters and window systems based on the reflection of laser/infrared/microwave beams. It is an excellent addition to high level countermeasures.
  • Can be customized the total acoustic barrier for any environment and purpose.


  • Type of Noise
    • Speech Protection: Distortion + Reverberation in a random sequence – 24 channels (Standard)
    • White Noise Generator: Non-filterable digital acoustic noise - 250-5000 Hz


  • Output
    • Communication Port : 24 (Standard) – Expandable to by 24 ports and up by the order
    • Noise Generator unit output: 3 Channels (70 W/Ch)
      • 4 Built-in speakers
      • Output capacity for Transducer( > 24) and Omni-Speaker (> 6)
      • RJ11 Type - 12 (Standard)


  • Standard Rack (19”) – Can be installed in any optional portable rack
    • 18.75" Rackable depth
    • Lightweight polyethylene construction
    • Front & rear rack rails
    • Threaded field replaceable 7mm zinc plated steel rack rails
    • Locking lids
    • Heavy duty twist latches
    • Comfortable recessed side handles
    • Heat treated 10/32 bolts with protective washers included
    • Interior Front Rail to Rear Rail Distance: 16.5"
    • Interior Front Rail to Rear Lid: 18.25"
    • Interior Lid Depth: 2.25"
    • Exterior: 13.5" x 22" x 22.375"
    • Power: AC 110 V ~ 220 V (Standard)


  • Weight:44 LBS (20 Kg) – Can be varied depend on options


  • Accessories (Sold separately)
    • Transducer: TRN 600 Series are the specially designed transducers which light weight and easy installation used to inject acoustic noise into walls, finished ceilings, windows, plumbing, and air ducts.
      • TRN 600S (Speaker + Vibration): 60g, W 60 mm x H 24 mm, RJ11 Jack
      • TRN 600U (Speaker + Vibration): 60g, W 60 mm x H 24 mm, Wire connection
  • Omni-Speaker (OMS2000) - 3Way, 2.0 lbs (900g), 5 x 5-3/5 in (12.6 x 14.4 cm), 24 ohm.


This Speech Protection System can be built variety of output options and specifications by the order.