Sound Masking in Offices: Enhancing Privacy and Productivity
The architecture and layout inside modern office buildings has changed considerably in just a couple of decades, going from numerous segregated rooms to an open plan style which allows for collaborative working and communication. In 2025, maintaining workplace privacy, productivity, and comfort requires effective acoustic management.
Sound masking is the inclusion of generated sound (commonly, though inaccurately, referred to as "white noise" or "pink noise") into an environment to mask unwanted sound. It relies on auditory masking. Sound masking is not a form of active noise control (noise cancellation technique); however, it can reduce or eliminate the perception of sound.
Sound masking is applied to an entire area to improve acoustical satisfaction, thus improving the acoustical privacy of the space. Sound masking means controlling background sounds in a developed environment. It is significant and prioritizes modifying the background sound (in contrast to background noise); however, there is substantial evidence produced and published by Banneker (BBN) and Kavanaugh[1] indicating that acoustical satisfaction within a space cannot be guaranteed without consideration of the three principal parameters of architectural acoustical design, formalized and established in the early 1900s by Sabine.
This issue has become prevalent in a variety of places, from offices and call centres through to retail stores and high street banks. In today’s modern work environment, privacy and focus are more important than ever. Whether you’re managing a corporate office, healthcare facility, or open-plan workspace, unwanted noise and distractions can negatively impact productivity, confidentiality, and overall comfort.
Sound masking is the process of adding a low-level, unobtrusive background noise to an environment to reduce the intelligibility of speech and other distractions. It doesn’t cancel noise but rather blends it into the background, making conversations and disruptive sounds less noticeable. Sound masking systems use specialized speakers to emit a uniform, ambient background noise that makes it more difficult to hear conversations or noises from a distance.
Sound masking works by reducing the difference between background noise levels and conversational speech, making it harder for people to unintentionally overhear discussions. Sound masking seeks to reduce the intelligibility of sound from a source by reducing the signal-to-noise ratio.
How Sound Masking Works
The solution is to install Sound Masking, which is a dedicated audio system that adds an unobtrusive background sound to reduce the intelligibility of speech from adjacent colleagues or customers. It was created to address the lack of speech privacy in open office workstations. Sound Masking works by broadcasting white or pink noise through a speaker to reduce distractions or provide confidentiality.
The technology used in a Sound Masking system usually consists of a dedicated Sound Masking Generator which is a device that you install in the area you want to mask. Sound Masking is a highly effective way to stop people from being distracted by each other when making phone calls or having conversations within an open plan area.
Typically an office without Sound Masking will have an ambient sound level of under 40 decibels. An Ambient level is defined by the noise which occurs when nobody is present in the room. Conversational speech levels tend to be near 65 decibels causing conversations to be understood, and distracting to others, from up to 15 metres away.
In order for Sound Masking to work it must reduce the difference between the steady background level and the transient levels associated with both speech and other sounds. The system capabilities must also be determined based on the amount of people in the office. The main element which you have to consider is the size and placing of the speakers which will create the white/pink noise, as well as the Sound Masking Generator.
If you would like assistance, please call our team today on T. At BCS Consultants, we understand the unique demands of modern workplaces. An office sound masking system introduces an unobtrusive ambient sound into your office environment. This carefully engineered background sound blends seamlessly into the office atmosphere, effectively reducing the clarity of speech from nearby conversations. Unlike white noise-which broadcasts equal sound across all frequencies, often perceived as static-sound masking for office environments specifically targets human speech frequencies to reduce distractions without being intrusive.
Benefits of Sound Masking
Sound masking is beneficial in various environments where noise control and speech privacy are essential. If your workplace suffers from excessive noise distractions or lack of speech privacy, sound masking can significantly improve the comfort and efficiency of your space. Whether you’re looking to reduce distractions, increase privacy, or improve employee productivity, sound masking is a smart investment for any organization.
A sound masking system can be used to reduce the impression of intruding sound (reducing annoyance, distraction) and improve acoustic privacy (including speech privacy). Sound masking systems are often relied upon as a basis of design with Sound Transmission Class (STC, as supported by ASTM E336) or Noise Isolation Class (NIC, as supported by ASTM E336) to ensure an appropriate level of privacy between contiguous rooms.
Various organizations (ASTM, ASA/ANSI, GBI, LEED, ASHRAE, WELL, etc.) define unique categories for labeling acoustical zones with purpose and/or function.
In recent years a number of psychological studies have been undertaken in office environments to gauge the need and effect of Sound Masking. In one study it was found that there is a modest stress increase and diminished motivation caused by typical office noises, including speech.
Applications of Sound Masking
- Open office plans - open offices can be either too quiet (where someone dropping a pen in the next cubicle is distracting) - or too noisy (where the conversations of others in the office make it impossible to concentrate).
- Private offices - private offices and other enclosed spaces often appear to provide privacy but do not. Many times, walls are lightweight and do not extend to the ceiling deck, but only to the ceiling tile. In these cases, sound can easily travel through partitions or over the walls.
- Public spaces - sound masking is useful for reception areas, pharmacies, waiting rooms, and financial institutions. Sound masking is provided in the area where conversations should not be heard - not necessarily in the area where the conversation is taking place. For instance, a psychiatrist would not want those in the waiting room to overhear a private conversation with a patient, so sound masking is provided in the waiting area, but not in the psychiatrist's office.
Several cases exist where sound masking has been successfully installed for exterior applications, the most common target of concern being roadway noise. In one example application, a large artificial waterfall was constructed as part of the garden exterior of an urban hotel in Santa Rosa, California.
Types of Sound Masking Systems
The plenum is the space between a "dropped" ceiling and the upper deck to the floor. In plenum sound masking systems, which employ a network of loudspeakers located completely within the plenum, were the first such systems developed and have been in use since the 1960s. Plenum-based speakers typically range 4-10 inches (10-25 cm) in diameter and generally face upwards, towards the upper deck. This is done to reflect sound from the speakers to broaden, as much as possible, the footprint from the speaker in the work area.
As with any commercial-grade sound masking system, an in-plenum sound masking system requires proper layout design, commissioning, and verification of the performance. Disregarding the importance of any of these stages in implementation will result in a sound masking system that does not perform according to the specifications of an acoustician. Only the most sophisticated sound masking systems can control the background sound level and spectra of masking sound accurately and precisely throughout a space, made possible only with the smallest zones (spatial limits around a speaker) and sophisticated electronics and software.
Uniformity can be achieved by adjusting the acoustic output of individual or a small groups of speakers. Adjustments routinely include changes in the output volume and output spectra of individual speakers.
Direct field sound masking systems have been in use since the late 1990s. The name takes after the mechanics of sound transmission which considers the "direct sound path" from the loudspeaker emitted towards the recipients (listeners) underneath. Initially used as an accessory for open office cubicles, direct field systems have been fully integrated into at least one open office furniture system and have been designed to be installed both in dropped ceilings and in offices without any absorptive ceiling systems.
When installed in dropped ceilings, direct field systems use speakers that are mounted facing down. When a ceiling tile is not available, they are mounted facing down on any available structure, sending the masking noise directly into the intended space. Theoretically, a direct field system would benefit from speakers that are omnidirectional, meaning that they transmit energy equally in essentially all directions. However, direct field systems require tighter arrays of loudspeakers given the polarity of the emission of sound.
Modern Office Acoustics
With the widespread adoption of hybrid working arrangements and the emphasis on collaboration spaces, offices today face unprecedented acoustic challenges. Zoned vs. Wired vs. Modern workplaces rely heavily on integrated technology solutions. A comprehensive office sound masking system should integrate smoothly with existing AV, paging, intercom, and building automation systems. At BCS Consultants, we specialize in seamlessly connecting commercial sound masking solutions with your existing unified communications, conferencing tools, and building management systems. BCS Consultants brings deep expertise in business audio visual equipment, structured cabling, and workplace technology systems. In 2025, maintaining workplace privacy, productivity, and comfort requires effective acoustic management.
When designing an optimal acoustic environment, consultants typically consider a variety of elements referred to as the ABC’s of acoustic design. In an ideal environment, the design elements would Absorb, Block and Cover sound. Consultants balance these elements to reduce conversational distractions while designing an open, aesthetically pleasing office. Sound masking is the “cover” portion of the equation. Sound masking is the addition of an unobtrusive background sound, similar to airflow, to reduce the intelligibility of human speech and reduce distractions.
Speech Privacy is the inability of an unintentional listener to understand someone’s words. The higher the privacy index, the more confidential the speaker’s conversation becomes. When someone’s conversation is clearly understood, the speech becomes a distraction, and the speaker has less privacy. With the addition of Qt sound masking, the speaker’s voice becomes less intelligible.
Imagine looking up at the stars on a clear night: The stars shine brightly against the night sky. As dawn breaks, the stars appear to dim as the ambient light increases. This works the same for human speech. As the ambient sound in the room increases, it becomes more challenging to discern an individual’s conversation from across the room.
Traditional Systems vs. Modern Solutions
Traditional sound masking systems, known as “in-plenum,” use large paint can-like loudspeakers installed above the ceiling tiles. Sound is bounced off the ceiling deck, through the ceiling material into the work space below. The sound from these systems can be unpredictable and create “hot” and “cold” spots. Masking sound can easily overflow into undesired spaces. In-plenum systems require significant design, installation and tuning time because there are many unknowns above the ceiling. If no ceiling exists, there is no plenum for traditional systems to operate within, significantly impacting performance. The pre-tuned masking sound is emitted through four sequenced channels that eliminate acoustic interference.