8 Factors to Consider when Designing for Sound

Have you ever attended a lecture or a play in an auditorium and barely been able to make out what the speaker was saying? Chances are the problem was poor acoustics. Next time you design, build, or review an auditorium, make sure to consider these 8 key factors that affect the acoustic performance and environment in the space.

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Key Factors for Auditorium Acoustics

There are a number of common complaints associated with acoustic performance in auditoriums. Echo & Reverberation is consistently number one, but exterior noise intrusion (from nearby classrooms or louder assembly areas), along with noisy background HVAC systems can also contribute to noise complaints. See below our checklist for ensuring ideal acoustics in your auditorium.

1. Reverberation Analysis for Auditoriums

Reverb is a significant issue when the size of the space is large, and the finishes are reflective. This is the case for many auditoriums, or gyms that double as a multi-purpose space. With CMU or drywall partitions and hardwood or parquet floors, echo is best reduced using the following techniques. To combat reverb in a large room:

• Build with sound absorbing materials in your design. Acoustic wall panels may be mounted on vertical surfaces, or suspended from exposed decking above, to absorb excess echo and improve auditorium acoustics
• Consider specialty treatments, such as stretched fabric wall systems, custom-designed and installed for auditorium spaces
• Hang thick, fabric curtains along walls to minimize hard surfaces
• All aisles should be carpeted to reduce foot-traffic noise
• Always use fabric seating when possible. Avoid metal and plastic, as they do not contribute to overall absorption
• Create a checkerboard pattern alternating between sound reflecting and sound absorbing materials along the ceiling.

NOTE: A basic acoustic analysis simply uses the room geometry and acoustic absorption coefficients to determine the expected reverberation time in the space. See a simple example below.

A more advanced analysis requires looking at specific frequency bands, often broken down into the 1/3rd octave bands. This is often required for auditoriums and other performance venues that may have more specific requirements.

2. Location – Prevent Exterior Noise Intrusion

For new auditoriums, the building should be planned as far away as possible from any potential noise sources such as highways, train tracks or industrial areas. Airport noise may also be particularly problematic in some locations. If this is the case, perform an Auditorium Sound Study prior to construction to ensure an adequate OITC is specified to prevent disruption inside the space. If necessary, you may need consider an acoustically-isolated ceiling, or use higher-density exterior walls and double-pane windows to prevent noise from nearby noise sources from bleeding into the space.

3. Buffer Zones around Auditorium

Isolate the auditorium from the rest of the building and potential noise sources by creating buffer zones.

Hallways and lobbies should separate the main auditorium from restrooms, mechanical equipment, dressing rooms etc. Surrounding space should be used for storage or offices that will be empty while the auditorium is in use.

Loud HVAC equipment should be acoustically isolated from any performance spaces.

RELATED: Auditorium Acoustic Treatment Case Study

4. Doorway STC – Prevent Noise Intrusion through Doorways

All doors should be solid-core, with airtight seals to inhibit outside noise from slipping in. Select STC-rated doors if the performance space is critical. While apartment doors may only require STC 32, we suggest STC performance in the 35-40 range. If double doors are used, ensure that an Astragal is installed in the center, and sufficient rubber gasketing is used to prevent flanking.

5. Auditorium Background Noise

Install sound absorbing duct liners and mufflers to reduce HVAC noise. HVAC design shall ensure that the NC (Noise Criteria) level is at or below NC-35. Critical spaces may require an NC level of 40.

NOTE: NC levels can be compared to similar dBA levels, if that is a preferred system for your acoustic consultant or mechanical designer.

6. Balcony Design

Balconies should be included where possible to reduce the distance between the farthest seats and the stage. The overhang should be of small depth and be fitted with sound absorbing material

7. Sound Systems for Auditoriums

Speakers should be placed just above and in front of the proscenium opening or arch. The controls for these speakers should be positioned in a central location of the seating area rather than in a separate room in the back of the auditorium.

8. Orchestra Pits

If the auditorium has an orchestra pit, soundproof curtains should be installed that can be opened and closed as the conductor chooses to control the noise level.

Auditorium Acoustics in Summary

Auditoriums, gyms, multi-purpose spaces and performance venues all have a wide range of functions, which can be enhanced with proper acoustic design.  Performances and events can often suffer when excess reverberation, noisy HVAC, or noise intrusion from outside sources disrupt the event. By following our acoustics checklist, you can reduce noise issues in your auditorium space, and provide an acoustically pleasant and functional environment.

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Auditorium Acoustics: 8 Factors to Consider

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Superior Auditorium Acoustics may be achieved by performing an Acoustic Sound Study prior to construction and implementing Acoustic Best Practices.

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Walker Peek

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Commercial Acoustics

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In the contemporary workplace, open-plan offices have become increasingly popular, favoured for their capacity to facilitate communication, collaboration, and innovation. However, these office layouts can also lead to increased noise levels and distractions, hindering productivity and overall employee well-being. To counteract these challenges, businesses must explore innovative design solutions that optimise the acoustics of their workspaces, ideally cultivating an atmosphere of focus, comfort, and efficiency.

Sound Zero, a leading commercial acoustic solutions provider based in London, understands the importance of creating acoustically-optimised office spaces and has a wealth of expertise in designing tailored solutions to achieve just that.

In this article, we will explore ten innovative design ideas that can significantly improve the acoustics of open-plan offices. From sound-absorbing materials to versatile room dividers, these design solutions will not only provide a quieter and more comfortable work environment but also contribute to the overall aesthetics and spatial layout of the office.

Stay tuned to learn how to revolutionise your workspace acoustics and unlock your employees’ full potential!

1. Utilising Sound-Absorbing Wall Panels

One of the most effective ways to reduce noise levels in an open office space is through the installation of sound-absorbing wall panels. These panels consist of specialised materials that absorb and dissipate sound waves, preventing echo and reverberation. Available in a wide range of colours, designs, and textures, sound-absorbing wall panels can be seamlessly integrated into the office décor, providing both practicality and visual appeal.

2. Employing Acoustic Ceiling Solutions

High ceilings and hard surfaces in open-plan offices can contribute to excessive noise levels by allowing sound to bounce and reverberate. Acoustic ceiling solutions, such as suspended ceiling baffles and acoustic tiles, can counteract these acoustic challenges. By installing these noise-reducing materials, businesses can minimise sound pollution while also enhancing the interior look of the workspace.

3. Incorporating Acoustic Furniture

Acoustic furniture is designed specifically to improve the sound quality within a space. These innovative furniture pieces typically have built-in sound-absorbing features, offering both practicality and style. Examples include partitions with integrated acoustic panels, upholstered seating with sound-absorbing properties or even office phone booths to provide quiet spaces for calls. Incorporating acoustic furniture into the office design can significantly contribute to a more comfortable work environment.

4. Integrating Flexible Room Dividers

Modular and flexible room dividers provide a versatile option for improving acoustics in open-plan offices. By creating separate areas and providing acoustic barriers, these dividers can substantially reduce noise distractions. Many room dividers also combine sound-absorbing materials with visually appealing designs, ensuring workplaces offer both acoustic comfort and aesthetic cohesion.

5. Optimising Flooring Solutions

The choice of office flooring is crucial in creating an acoustic-friendly space. Carpets, rugs, and vinyl flooring with acoustic underlays can all help to absorb sound and minimise noise transfer beneath foot traffic. Choosing the right flooring materials can have a significant impact on overall office acoustics, contributing to a quieter and more pleasant work environment.

6. Using Acoustic Screens

Acoustic screens and partitions can be strategically placed in open office spaces for targeted noise reduction and increased privacy, as they offer an adaptable and portable solution. Available in various sizes and designs, acoustic screens are an excellent solution for businesses looking to optimise sound management without sacrificing the visual appeal of their spaces.

7. Installing Acoustic Window Treatments

External noise can infiltrate the office space, impacting employee concentration and productivity. Acoustic window treatments, such as double-glazed windows, can help block out unwanted noise while improving the energy efficiency of the office. Additionally, heavy sound-absorbing curtains or blinds can offer further sound insulation and control sunlight exposure, creating a comfortable and acoustically-optimised work setting.

8. Configuring Space Layout and Design

A strategic approach to space planning can significantly impact the acoustics of an open-plan office. By arranging workstations, meeting rooms, and collaboration areas thoughtfully, businesses can minimise noise distractions and create an environment conducive to productivity. For example, placing quiet zones, such as individual work pods or focused seating areas, away from high traffic or noisy collaboration spaces ensures that distractions are minimised.

9. Implementing Acoustic Signage and Artwork

To improve office acoustics without sacrificing aesthetics, businesses can incorporate acoustic signage and artwork into their space. Custom sound-absorbing panels can be printed with company branding, logos or artwork to enhance the workspace visually and acoustically. These solutions enable businesses to maintain a stylish and unique office design while optimising sound quality.

10. Educating and Encouraging Noise-Etiquette

Implementing acoustic solutions alone may not wholly alleviate noise distractions in an open-plan office. It is essential also to educate employees on noise etiquette and encourage practices that help maintain a pleasant working environment. By fostering a culture of noise awareness, businesses can ensure that productivity and comfort levels are maintained despite the challenges of an open-plan workspace.

Achieving the Perfect Balance of Acoustics and Aesthetics for Your Office Space

Creating an acoustically-optimised office space is essential for enhancing employee productivity, well-being, and satisfaction in today’s competitive and demanding work environment. The numerous innovative design solutions discussed in this article highlight the variety of techniques and materials available to address the unique challenges of open-plan offices. From sound-absorbing wall panels to versatile room dividers, acoustic solutions can be seamlessly integrated into the office design, maintaining the visual appeal whilst providing a quieter and more comfortable workspace for employees.

At Sound Zero, we understand the importance of striking the perfect balance between aesthetics and acoustics in contemporary office spaces. Our team of professionals are committed to helping businesses navigate the complexities of noise control and providing bespoke solutions specific to the needs of their work environment. With our guidance and expertise, we can ensure that your office space achieves the optimal combination of design and functionality, fostering a productive and pleasant atmosphere for your employees.

Ready to transform your office space into an acoustically-optimised workspace? Partner with Sound Zero on your journey towards creating the perfect work environment tailored to your business’s unique needs. Discover our comprehensive range of bespoke acoustic office solutions by reaching out today, and let us help you turn your office space into a haven of productivity and tranquillity!

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