PBN-ASU Audio Suppressor Universal

Key Features:

• Targeted Audio Suppression:
  Reduces the effectiveness of smartphone microphones in close proximity, limiting the ability to capture intelligible speech.
• Maintains Device Functionality:
  Phones remain fully operational, with calls, messages, and applications continuing as normal.
• Controlled Acoustic Environment:
  Creates a localized suppression zone around the device, addressing microphone-based recording without signal interference.
• Immediate Operation:
  No setup, pairing, or configuration required. Position the device and it operates automatically.
• Cross-Platform Compatibility:
  Works with iPhone and Android smartphones across standard recording and video applications.
• Discreet Deployment:
  Designed for use in professional environments where privacy is required without disrupting workflow or communication.
• Practical Privacy Control:
  Designed for environments where devices cannot be removed, the PBN-ASU provides a practical method of reducing recording risk while maintaining normal operational use.

PBN-ASU Audio Suppressor Universal

The PBN-ASU Audio Suppressor Universal is a professional privacy control solution designed to reduce the risk of smartphone audio recording in sensitive environments.

Smartphones are now a constant presence in meetings, consultations, and operational settings. With built-in microphones and recording capability across standard applications, they introduce a persistent and often unmanaged exposure point during confidential discussions.

Traditional controls, such as removing devices or using signal-blocking solutions, can be effective but are often impractical in real-world environments where communication must remain active.

A Controlled Alternative

The PBN-ASU is designed to address the primary vulnerability – smartphone microphone recording – without interrupting normal device use.

Rather than blocking signals, the system creates a controlled acoustic environment around the device. This reduces the ability of nearby smartphones to capture intelligible speech while allowing calls, messages, and applications to function as normal.

This approach enables organisations to maintain operational continuity while introducing a practical layer of privacy protection.

Core Function

The PBN-ASU reduces the effectiveness of smartphone microphones within its operating zone.

When a device is positioned correctly, the system limits the clarity and usability of captured audio across standard recording and video applications. This applies regardless of the application in use, as all rely on the same microphone input pathway.

The system operates by introducing controlled acoustic interference within the immediate vicinity of the device, affecting how microphones capture speech.

At the same time, normal device functionality remains unaffected. Calls, notifications, and applications continue to operate without disruption.

Designed for Professional Environments

The PBN-ASU is suited to environments where confidentiality is required but device access cannot be restricted.

This includes:

• Executive and board-level meetings
• Legal and advisory consultations
• Research and development environments
• Government and secure operational settings

In these scenarios, the ability to maintain communication while reducing recording risk is critical.

Practical Security Without Disruption

Signal-blocking solutions isolate devices completely, removing connectivity and limiting usability.

The PBN-ASU provides a more practical approach by addressing how recordings actually occur—through the smartphone microphone—while allowing devices to remain active and accessible.

This enables organisations to apply a layer of control without disrupting workflow or communication.

Usage Guidance

For effective operation, the smartphone should be placed within the intended operating zone of the device and left in position during use.

Brief interaction, such as checking notifications or viewing messages, is acceptable. However, continuous handling or extended use within close proximity is not recommended while the system is active.

Maintaining correct positioning ensures consistent performance throughout the session.

Simple by Design

The PBN-ASU is designed for immediate use in professional environments.

There is no setup, no configuration, and no reliance on software or user input. Once positioned correctly, the system operates automatically, allowing it to be integrated into existing workflows without training or disruption.

User Groups

Corporate Security & Executive Teams

Enables structured control of personal devices during sensitive discussions without removing usability. Aligns with boardroom protocols and compliance-led environments.

Legal, Investigations & Advisory

Supports interviews, consultations, and case discussions where devices remain present but audio capture must be managed consistently.

Government & Regulated Environments

Suitable for controlled rooms where device handling policies are enforced. Provides a practical alternative to full device isolation workflows.

Security Consultants & Integrators

Integrates into room procedures as a repeatable, proximity-based control that does not rely on complex setup or user training.

Pro Tips (Operational Use)

Proximity Drives Outcome

Effectiveness increases as the device approaches the unit. Best performance is achieved when phones are placed on the desk, near the ASU.

Control the Placement

Define a simple rule: devices remain within the working area of the unit during discussions. This replaces “remove the phone” with “place the phone here.”

Desk-Level Deployment

This is a point-of-capture control, not a room-wide system. Position on the table where devices naturally sit.

Always-On in Controlled Rooms

Keep units powered in spaces used for sensitive conversations to remove reliance on manual activation.

Scale with Table Size

Extend coverage by adding units so all participants remain within proximity.

Deployment Scenarios

Boardrooms & Meeting Tables

Units placed centrally (or distributed across larger tables) where phones are typically set down.

Interviews & Consultations

Position between participants to manage device-based recording risk without interrupting workflow.

Controlled Secure Rooms

Supports policies that allow device presence under defined placement conditions, offering a workable alternative to Faraday-only procedures.

Temporary Environments

Deploy in hotels, project rooms, or rented spaces where permanent controls are not available.

Built for Current Device Behaviour

Designed for modern smartphones with multiple microphones and audio processing features.

Performance is achieved at the device, where recording occurs, rather than relying on broader environmental effects.

Use Principle

Keep devices within proximity of the unit to maintain control of audio capture.

Modern smartphones are now capable of high quality audio recording at any time, often without clear indication.

In environments where sensitive discussions take place, this creates a consistent and often unmanaged risk.

The Audio Suppressor Universal (PBN-ASU) is designed to control audio capture at the point of the device.

It allows smartphones to remain present while preventing usable recordings when placed inside the Audio Suppressor Universal.

Compatible with all Modern Smartphones

Smartphone dimensions have stabilised across the flagship market.

While designs continue to evolve, overall device size now falls within a consistent range, supporting long term use of the PBN-ASU against modern devices.

The table below presents a controlled sample of tested smartphones.

It outlines device dimensions, confirms compatibility, and reports microphone protection performance under proximity based conditions.

Brand	Model	Device Dimensions (L × W)	Microphone Protection Result	Compatibility
Apple	iPhone 17 Pro Max	160.8 × 78.1 mm	100%	✔ Compatible
Samsung	Galaxy S25 Ultra	162.3 × 79 mm	100%	✔ Compatible
Samsung	Galaxy Z Fold7 (Folded)	155.1 × 67.1 mm	100%	✔ Compatible
Google	Pixel 9 Pro	162.7 × 76.6 mm	100%	✔ Compatible
Huawei	Pura 80 Ultra	162.6 × 75.4 mm	100%	✔ Compatible
Xiaomi	15 Ultra	161.4 × 75.3 mm	100%	✔ Compatible