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Rw vs STC — Advanced Guide

Two Systems, One Idea Both Rw (ISO) and STC (ASTM) are single-number ratings of airborne sound insulation. They answer the same question — how well does an element block sound — but use different stan...

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What Is Sound Transmission Loss (TL)?

Definition Sound Transmission Loss (TL) is the frequency-dependent reduction in sound energy as it passes through a building element — a wall, floor, ceiling, door or window. It is expressed in decibe...

Aug 28, 2026 3 min read
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Acoustic Treatment for Schools

Why School Acoustics Matter Learning depends on hearing the teacher clearly. Excessive reverberation and background noise reduce speech intelligibility , especially for younger children and those with...

Aug 28, 2026 2 min read
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Acoustic Treatment for Hospitals

Why Hospital Acoustics Matter Hospitals are noisy environments where sleep, privacy and staff communication matter. High noise levels can disturb patient recovery and increase stress. Acoustic treatme...

Aug 28, 2026 2 min read
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RT60 Design for Offices and Meeting Rooms

Why RT60 Matters in Offices In offices and meeting rooms, excessive reverberation smears speech and raises noise. Controlling RT60 — the time for sound to decay by 60dB — keeps speech intelligible and...

Aug 28, 2026 2 min read
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Acoustic Treatment for Open-Plan Offices

The Open-Plan Challenge Open-plan offices combine many simultaneous speech sources in one large space. Without treatment, reverberation builds up and speech carries across the floor, hurting concentra...

Aug 28, 2026 2 min read
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How to Improve Room Acoustics

What "Good" Room Acoustics Means Good room acoustics means sound behaves predictably and comfortably: speech is clear, music is balanced, and excessive echo is controlled. The central measure is the r...

Aug 28, 2026 2 min read
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How Sound Absorption Is Measured

Overview Sound absorption is measured in a reverberation room — a large, hard-surfaced enclosure designed to reflect sound for a long time. The two equivalent standards are ISO 354 and ASTM C423 . The...

Aug 28, 2026 4 min read
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How to Choose Acoustic Panel Thickness and Air Gap

Why Thickness and Air Gap Matter Sound absorption is frequency-dependent . A material absorbs most effectively at frequencies whose wavelength is comparable to its thickness. Because low frequencies h...

Aug 28, 2026 3 min read
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What Is Sound Absorption?

Definition Sound absorption is the process by which a material converts incident sound energy into heat instead of reflecting it back into the room. It is what reduces echo and reverberation inside a ...

Aug 28, 2026 4 min read
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NRC vs SAA vs αw: What Is the Difference?

Definition Sound absorption is described by a frequency-dependent coefficient α (see Sound Absorption Coefficient ). Because a full curve is inconvenient to compare, three different single-number rati...

Aug 28, 2026 7 min read