What is Reverberation Time (RT60)

Reverberation Time (RT60) measures how long it takes for sound to decay by 60 decibels after the source stops. It indicates how reflective or absorptive a space is. Shorter RT60 improves speech clarity, while longer RT60 increases echo and noise buildup, impacting comfort and overall acoustic performance.

Why Reverberation Time Matters for Speech Clarity

Reverberation Time (RT60) plays a key role in how sound is experienced within a space. It measures how long sound lingers after it is produced, which directly affects clarity, comfort, and overall acoustic quality. In environments with a long RT60, sound reflects off hard surfaces and builds over time, creating echoes and making speech harder to understand. This can quickly lead to fatigue and distraction, especially in shared or high-traffic spaces.

In contrast, a shorter RT60 indicates that sound is absorbed more efficiently, allowing speech to remain clear and controlled. This is especially important in enclosed or semi-enclosed environments where conversations are the primary activity. Materials, surface finishes, and interior design all influence reverberation time, shaping how sound behaves within a space. While RT60 is a useful metric for understanding internal acoustics, it should be considered alongside other factors like sound leakage and speech reduction. Together, these elements determine not just how sound behaves inside a space, but how it is perceived both within and beyond it, ultimately influencing comfort, focus, and usability.