What is Reverberation Time (RT60) and How to Control It?

In the world of architectural acoustics, the difference between a high-end professional space and a poorly designed room often comes down to one invisible metric: Reverberation Time, commonly known as RT60.

If you have ever been in a meeting room where voices sound “muddy” or a restaurant where the background noise feels overwhelming, you have experienced the negative effects of uncontrolled RT60. For architects and designers, mastering this metric is essential to creating environments that are not only beautiful but also acoustically functional.

What is RT60

Simply put, RT60 is the time it takes for a sound to decay by 60 decibels after the source of the sound has stopped. Think of it as the “life span” of an echo within a room.

When a sound is made, it bounces off walls, ceilings, and floors. If these surfaces are hard and reflective, the sound lingers, creating a wash of noise that overlaps with the next word spoken. This ruins speech intelligibility, making it difficult for people to communicate effectively.

At Oli Acoustics, we believe that achieving the perfect sound starts long before the first panel is installed. Our initial Needs Analysis phase always prioritizes understanding the expected noise reduction effect and the unique acoustic signature of your space. By establishing clear technical goals early on, we follow a strictly defined custom acoustic panels process to ensure that controlling the target RT60 is the foundational first step in our professional acoustic design and engineering service.

Why RT60 Targets Matter for Different Environments

Not every room should have the same RT60. The “ideal” time depends entirely on the room’s purpose, a detail we clarify by grasping the project space layout and relevant industry-specific standards.

• Office & Meeting Rooms (< 0.6s): In these spaces, clarity is king. A low RT60 ensures that voices are crisp and that digital microphones (for video calls) don’t pick up distracting echoes.
• Recording Studios (0.2s – 0.4s): To capture “dry” and accurate sound, the reverberation must be almost entirely eliminated using high-performance certified sound-absorbing materials like polyester fiber or glass wool.
• Concert Halls (1.5s – 2.0s): Unlike offices, musical venues actually need some reverberation to “warm up” the sound and give it richness.

The Calculation: Predicting the Echo Before Installation

Predicting the RT60 of a space is a blend of physics and geometry. The calculation factors in the room’s total volume, the surface area of every wall, floor, and ceiling, and the specific sound absorption coefficient of every material used, as defined by international measurement standards.

At Oli Acoustics, we do not leave these results to chance. Our team of experienced acoustic design teams uses advanced software to simulate sound-absorbing effects according to your specific scenario. By creating these effect simulation reports, we can pinpoint exactly where echoes will occur and recommend the precise quantity of material needed to meet your decibel reduction targets before the first panel is ever manufactured.

How to Control RT60 with Bespoke Materials

Once the target RT60 is established through simulation, the next step is selecting and customizing the right materials to achieve it.

• Custom Performance Layers: Depending on the frequency of the noise (low vs. high), we recommend specific sound-insulating materials or porous ceramic products to achieve maximum decibel reduction and isolation.
• Bespoke Dimensions for Precise Coverage: Standard-sized panels often leave “gaps” in acoustic coverage; therefore, our Graphic Design Needs process allows for custom sizes and textures to ensure that every square inch of treated surface area contributes to the overall RT60 goal.
• Aesthetic Integration: Through our RAL color matching and diverse finish options, these technical materials serve as a seamless part of your interior decoration rather than a functional afterthought.

By integrating Acoustic Design Drawings with Bespoke Fabrication, we ensure that your project meets both the technical RT60 requirements and your visual design standards.

Conclusion

Controlling RT60 is not just about reducing noise; it’s about engineering an environment where communication is clear and comfort is paramount. A successful project requires a synergy between technical simulation, precise material selection, and expert installation guidance.

Partner with Oli Acoustics

Since 2020, we have committed to a strict quality control system from raw material procurement to final delivery. Our dedicated Communication Mechanism ensures that you have constant access to both sales and technical staff throughout the project’s lifecycle.

Ready to optimize the acoustics of your next project? Contact our technical team today for a professional acoustic simulation and bespoke material quotation.