Sound masking

Sound masking protects speech privacy by adding tuned background sound that makes conversations unintelligible beyond the room. It suits boardrooms and briefing rooms where sensitive matters are discussed. The system is tuned to the room: loud enough to mask speech at the door, quiet enough to work beside.

• Speech privacyProtects conversations in secure rooms
• Tuned background soundMasks intelligible speech
• Zoned coverageEach room tuned separately
• No recordingThe system listens to nothing

What is sound masking

Sound masking is the addition of a low, tuned background sound to a room so that speech cannot be understood outside it. Small emitters, usually above the ceiling, fill the space with a neutral sound shaped to cover the frequencies of human speech. It is part of our shielding range because it protects information, just as RF shielding protects signals.

Masking is not soundproofing. Soundproofing blocks sound from leaving a room; masking makes any speech that does escape unintelligible. The two treatments work well together, but they solve different problems and are specified separately.

Which sound masking specification do you need

Specify by room, not by building. Each room is surveyed and tuned on its own, because ceiling height, finishes and background noise all change the result.

How sound masking works

Emitters mounted above the ceiling, or on walls where there is no ceiling void, produce a shaped background sound across the speech frequencies. A central controller sets the level and tone for each zone, and the system is tuned after installation by measuring speech intelligibility in and around the room.

The level is set to sit just below conscious notice: occupants stop hearing it within minutes, but an eavesdropper outside the room hears only an unintelligible murmur. The system emits sound only; it has no microphones and records nothing.

Zoning follows the floor plan: each meeting room gets its own zone, while open areas share a background level that keeps the whole floor comfortable. The controller can schedule levels by time of day, lowering masking after hours when the building is empty. During commissioning, the engineer measures speech intelligibility at doors, partitions and neighbouring desks, then adjusts each zone until conversations stay private without the system drawing attention to itself.

Masking is not soundproofing. Soundproofing blocks sound leaving a room; masking makes any escaping speech unintelligible. The two work well together but they are different treatments.

Combining sound masking with other ratings

Masking works best as part of a layered room. Security doors rated to LPS 1175 cut the direct sound path through the entrance, and fire and security doors do the same where fire separation is required. Where electronic eavesdropping is also a concern, RF shielding protects the room’s signals while masking protects its speech. Our standards hub explains the rating systems behind these products.

Where sound masking is used

Government and defence briefing rooms and secure meeting suites are the classic setting. Banking and finance boardrooms and deal rooms protect commercially sensitive discussion. Any organisation that discusses sensitive matters near circulation space or neighbouring tenancies can benefit.

Cost and lead time factors for sound masking

The number of rooms and zones sets the equipment scope, and ceiling type decides how emitters are mounted: lay-in ceilings are simplest, while solid soffits need surface or wall mounting. Coordination with the fit-out contractor avoids clashes with lighting, sprinklers and air conditioning. Tuning and commissioning take a site visit per zone after the fit-out is complete. No prices are given here because every floor plate differs.

How to specify sound masking

1. Identify the rooms. List where sensitive speech happens.
2. Survey the acoustics. Measure background noise and construction.
3. Design the zoning. Give each room its own zone and level.
4. Install the emitters. Coordinate with the fit-out trades.
5. Tune and commission. Set levels by measurement, not by ear.
6. Handover and briefing. Show facilities how the zones work.

Sound masking FAQs