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Acoustic Noise Generator Protect Private Conversations

Designed to create a perimeter of protection around any building for the purpose of defending against common eavesdropping threats, the ANG2200 is a sophisticated counter surveillance system that has been proven by experienced professionals to successfully protect the privacy of any conversation.

Acoustic Noise Generator


Offers two channels, each with high and low frequency control to compensate for material composition, with truly random noise sources.

Noise Generator Efficiency
360° Speakers

360° Speakers

Used specifically with the ANG2200, the OMS is an omnidirectional speaker that projects white noise into area such as drop ceilings, crawl spaces, and air ducts masking the listening and recording capabilities of eavesdropping equipment

TRN Transducer

Used specifically with the ANG2200, the TRN is a transducer designed to inject white noise into walls, ceilings, windows, plumbing, and air ducts masking the listening and recording capabilities of eavesdropping equipment. (optional window mounts are available)

TRN Transducer


Offers two channels, each with high and low frequency control to compensate for material composition, with truly random noise sources.


Masking system injects noise into the environment perimeter and not directly into the environment allowing normal conversation while defeating eavesdropping devices.


Optional accessories (transducer, omnidirectional speaker, window mounts) can be purchased to tailor the ANG-2200 to the environment of concern.



  • Independent random noise source
  • Output Voltage: 12Vp-p @ 6Ω (2 Ω min load)
  • Frequency range: 125 Hz - 4 kHz
  • Equalizer: LF 180 Hz ± 12 dB, HF 3 Khz ± 12 dB
  • Power
  • 15 VDC @ 1 A (AC adaptor supplied for 120 or 240 VAC)
  • Mechanical
  • Unit dimensions: 1.6 x 5.5 x 8 in (4.1 x 14.0 x 20.3 cm)
  • Unit weight: 1.3 lb. (590 g)
  • Features
  • Two separate channels
  • Truly random noise sources
  • High and low frequency controls
  • Overload protection
  • Applications
  • Technical Surveillance Countermeasures (TSCM)
  • Counter Surveillance
  • Audio Masking
  • Noise Generation
  • Eavesdropping Prevention
  • Intelligence Protection
  • Executive Protection

Frequently Asked Questions

Does this protect the conversation I have in meetings? I am worried about intellectual data being leaked.

The ANG-2200 is designed to help defend against listening devices that depend on acoustic energy being transferred through structural elements of your immediate environment (such as windows, walls, ceilings, ductwork or plumbing).

Do I need to purchase the entire kit with many add ons?

Depends on the size of the room you want to secure. The combination of the ANG-2200, proper transducer and speaker installation, and an educated operator will contribute to a strong perimeter of protection. Contact our sales team to see what package is write for you?

Does this device block audio recorders or transmitting microphones?

The ANG-2200 does not offer protection from recording or transmitting devices located within the perimeter; the ANG-2200 only provides protection against structure bound audio leakage.

What if I am worried about audio recording devices and/or microphone transmitters within the perimeter?

We recommend a thorough countermeasures sweep accompanied by a physical search to be performed prior to the installation of the ANG-2200 system and periodic sweeps thereafter to ensure the integrity of the protected environment. You can contact our sales team to schedule one of our private investigators to conduct a sweep.

Is this product illegal to have?

No. REI products are designed and intended for legal commercial applications, however because laws and regulations vary from state to state and country to country, it is the sole responsibility of the purchaser and user/operator to check and comply with all applicable laws and regulations for the possession and operation of this equipment before and after making a purchase.

If this product only protects from outside intrusion, what would I be worried about?

Sound vibrates surfaces such as walls, glass, and doors. A contact microphone can pick up these vibrations and transmit the information along wires or modulate it onto radio waves to be received by an unwanted listener outside the room. Laser and microwave beams reflected off these surfaces are modulated with the information and pose the same threat.

But I have checked the room and it’s clear of any bugs, why should I be worried still?

Vibrations caused from talking in a room can be transferred along air ducts, plumbing, walls, ceilings, etc. These vibrations can be intercepted and monitored by persons several floors or rooms away. This means that even though a room has been cleared of eavesdropping devices, the voice information from within that room may still be vulnerable.

I am still a little confused. How does this work exactly?

The ANG-2200 system sets up a perimeter of masking noise around a room that creates a sound barrier to disrupt voice leakage. The TRN-2000 transducers are designed to inject masking noise onto the room surfaces while the OMS-2000 speakers are used to provide protection in open air spaces such as in closets, above ceiling tile, and in crawl spaces. This method provides a much greater masking noise envelope while producing less obtrusive noise in a room than a loudspeaker.

Why is it called a noise generator?

The ANG-2200 contains two separate random noise generators. There are several products in a host of markets that use noise generators, but most of these use pseudo-random noise. Pseudo-random noise is generated by a mathematical formula or a pre-calculated list of values and is in most cases predictable. This predictability allows a sophisticated eavesdropper to correlate on this predicted noise and extract the room’s information. True random noise is naturally generated and completely unpredictable and eliminates this threat. The ANG-2200 uses true random noise.

I am worried about my voice signature, does this protect it?

With voice masking yes. The human voice produces many frequencies when producing speech. The frequencies and their strengths are dependent on the individual and the sound he or she is making. The spoken word typically produces frequencies in the range of 100Hz to 6000Hz. Intelligible speech resides in the range of 300Hz to 3000Hz. This means that though the voice has lower and higher frequencies, the ability to understand the differences in sounds in order to create speech consists of a smaller frequency range. The ANG-2200 shapes its noise spectrum to allow for more energy within the intelligible frequency band. This shape allows for greater efficiency, better protection, and a lower obtrusive noise level.

What is used to operate this device?

The ANG-2200 uses a combination of transducers and speakers placed strategically throughout a target area to create a blanket of masking noise that covers private conversations from eavesdropping. Each transducer utilizes adapters for mounting to a variety of surfaces such as walls, windows, ductwork, plumbing, etc. When transducers are mounted to surfaces, the surface’s material can change the shape of the ANG-2200’s frequency spectrum, altering the effectiveness of the noise. The LF and HF slope controls are used to equalize the noise back to the correct shape that is required to mask intelligible speech. The two separate outputs allow the user to tailor the noise for separate surface materials, allowing greater flexibility and increased protection.

Is it difficult to install and operate?

Not really, but you would need some understanding on how its placed and where to place the different devices. Also with the program, you would also need to know how to analyze data. If you need a professional to install, please contact us and we can have one of our experts install and explain how to operate.

What type of customers utilize this?

All tyoeps but our main clients are business professionals, government, private organizations and high level security persons.

Why is counter surveillance so important?

Counter surveillance is a continual challenge for security. The security individual must constantly be on guard for new techniques and technologies. You never know hen someone is out to steal your ideas or business. Also it’s just good practice to always stay secure in your dealings.

Again, how will I know how many pieces of what to purchase and where to place them?

Determine the quantity of TRN-2000 transducers needed using the guidelines below:

WALLS – One transducer placed every eight linear feet, centered between floor and ceiling. Mount on or within six inches of a stud.

FLOOR and CEILING – One transducer centered on every sixty-four square feet. (Use the OMS-2000 speaker for drop ceiling.)

WINDOWS – One transducer placed on every major frame of glass within six inches of the corner.

DOORS – One transducer placed adjacent to the center hinge on the doorframe.

Also you can read the full guide on the product page or contact our team and we can guide you on what you need to purchase. In addition, we can also install for you.

Is this warrantied?

With REI manufacturing government quality products we assure that all equipment will not fail but things happen. All products are tested before set out to any client. Yes. All equipment is warrantied up to 1 year through REI manufacture. IF anything malfunctions after one year, you can still repair items via REI.

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