Articles tagged “diffuse field”
4 articles covering diffuse field in acoustic engineering and building design.
What is Late Reverberation? The Diffuse Tail That Defines a Room
Late reverberation is the diffuse sound energy arriving after the first 50-80ms. Learn how it shapes perceived warmth, when it helps music, when it hurts speech, and how RT60 measures it.
Sabine vs Eyring Equation — When Sabine Fails Above α 0.4 | Free Calculator | AcousPlan
Sabine's equation overestimates RT60 by 47% when average absorption exceeds 0.4. Full error table and decision tree for choosing the right formula.
Deriving Sabine's and Eyring's Reverberation Time Formulas from First Principles
Step-by-step mathematical derivation of Sabine's T60 = 0.161V/A and Eyring's T60 = -0.161V/(S·ln(1-ᾱ)) from the diffuse field energy balance. With worked examples showing why Sabine fails at high absorption and when Eyring is the better choice.
Why Sabine's Formula Gives Wrong Results in Open Plan Offices
Sabine's formula assumes a perfectly diffuse sound field — uniform energy density throughout the room. Open plan offices violate this assumption completely. Here is why standard RT60 calculation fails for open offices and what ISO 3382-1 Annex A recommends instead.