Reverberation Time (RT60): Why It Matters in Architectural Acoustics

Reverberation time (RT60) is a key factor in designing acoustically comfortable spaces. It measures how long sound lingers in a room after a source stops, affecting speech clarity, noise levels, and overall usability. In practice, a long RT60 makes speech sound muffled and difficult to understand, while a short RT60 can make a room feel unnaturally quiet or “dead.” The right balance ensures speech is clear, noise is controlled, and the space functions as intended.

Why RT60 Matters

• Short RT60 (0.4–0.6s) improves speech clarity in offices, classrooms, and meeting rooms.

• Longer RT60 (1.8–2.2s) enhances musical richness in concert halls and theaters.

• Balanced RT60 is essential for restaurants, hotels, and open spaces to maintain ambiance while controlling noise.

What Influences RT60?

• Room Size & Shape – Larger rooms naturally have longer RT60.

• Surface Materials – Hard surfaces (glass, concrete) increase reverberation, while absorptive materials (felt panels, carpets) reduce it.

• Ceiling Height – High ceilings need acoustic treatments like baffles or suspended panels to manage sound reflection.

How to Control RT60?

• Wall & Ceiling Panels – Absorptive materials like recycled felt reduce excessive reverberation.

• Furniture & Textiles – Upholstered furniture, rugs, and curtains help absorb sound.

• Diffusers – Scattering sound instead of absorbing it improves acoustic balance in performance spaces.

Echo Design Solutions

At Echo Design, we help architects and contractors achieve optimal RT60 with custom acoustic panels and ceiling solutions. Whether it’s an office, restaurant, or auditorium, we ensure spaces sound as good as they look.