Articles tagged “room acoustics”
17 articles covering room acoustics in acoustic engineering and building design.
Building Acoustics vs Room Acoustics: What's the Difference?
Building acoustics blocks sound between rooms using mass and decoupling (STC/Rw). Room acoustics controls sound within a room using absorption (RT60/C80). Here is when you need each, how they interact, and the standards that govern them.
What Is a Sabin? The Acoustic Absorption Unit Explained
A sabin is the unit of sound absorption equivalent to 1 square foot of perfectly absorptive surface. Learn how sabins relate to absorption coefficients, how to calculate total room absorption in sabins, and why thinking in sabins instead of alpha values prevents acoustic design failures.
The Acoustic Design Process: From Brief to Handover in 8 Steps
Acoustic design follows a structured 8-step process: establish criteria, model the room, calculate the baseline, identify deficiencies, specify treatment, verify compliance, document, and measure post-construction. Here is each step explained with the specific deliverables and ISO references.
How to Measure Room Acoustics: Equipment, Methods, and What the Numbers Mean
Measuring room acoustics requires a sound source, a microphone, and analysis software — but the method you choose determines whether your results are valid. Here is a practical guide to acoustic measurement: from balloon pops to dodecahedron speakers, from smartphone apps to ISO 3382-compliant equipment.
Room Acoustics Fundamentals: How Sound Behaves Inside a Room
Sound in a room does not simply travel from source to listener. It reflects off every surface, arrives at the listener hundreds of times with different delays, and creates a complex acoustic signature. Here are the fundamentals of room acoustics — from direct sound to late reflections to standing waves.
What Is RT60 — And Why It Determines Whether Your Room Sounds Good or Terrible
RT60 is the time it takes for sound to decay by 60dB after a source stops. Too long and speech blurs. Too short and rooms feel dead. Here is what RT60 means, why it matters for every room type, and the optimal targets that acoustic standards have established over 100 years of research.
What Is STI (Speech Transmission Index) — Can People Actually Understand Speech in Your Room?
STI measures how much a room degrades speech from source to listener, on a scale from 0 (unintelligible) to 1 (perfect). An STI below 0.50 means one in four words is lost. Here is how STI works, what scores you need, and why reverberation time alone is not enough.
AFMG Software Alternative — Acoustic Compliance Without the Learning Curve
AFMG (makers of EASE, EASERA, SYSTUNE) produces professional acoustic tools requiring significant training. AcousPlan delivers compliance-grade acoustic design for architects in minutes, not weeks.
EASE 5 Alternative — Acoustic Design for Architects Who Aren't Acoustic Engineers
EASE 5 requires an acoustic engineering background and costs $3,500/year. AcousPlan was built specifically for architects and designers — ISO 3382 compliant, free to start, results in 90 seconds.
Free Acoustic Software in 2026: Every Free Tool for Room Acoustics Compared
A comprehensive comparison of every free acoustic tool available in 2026 — from browser-based calculators and open-source desktop software to Python libraries and mobile measurement apps. Includes feature tables, platform details, and guidance on when free tools are sufficient versus when professional software is necessary.
ODEON Alternative: Free Room Acoustics Software for RT60, STI, and Compliance
ODEON is the gold standard for ray tracing room acoustics, but its €5,000+ license and steep learning curve put it out of reach for many professionals. This comparison examines where ODEON excels, where a free cloud-based alternative like AcousPlan covers 80% of use cases, and how to decide which tool fits your project.
Free ODEON Alternative — Web-Based Acoustic Design Without the $2,800/Year Fee
ODEON costs $2,800/year, requires Windows, and takes weeks to learn. AcousPlan is free, web-based, and produces ISO 3382-compliant RT60 results in 90 seconds. An honest comparison for architects who need acoustic compliance without a consulting budget.
Sabine vs Eyring: When to Use Each RT60 Formula and How Big the Error Can Be
Sabine overestimates RT60 by 15-40% in rooms with high absorption. Eyring corrects this but breaks down in rooms with very non-uniform absorption. Here is a worked comparison for 5 room types showing exactly when each formula is appropriate and the magnitude of the error when you choose wrong.
Sarooma Alternative — Free Acoustic Design With ISO 3382 Compliance
Sarooma offers freemium RT60 calculation. AcousPlan adds WELL/LEED compliance reports, Snap & Solve floor plan analysis, AI material prescription, and 5,678-entry materials database. Full comparison.
Treble Alternative: How AcousPlan Compares for Room Acoustic Simulation
Treble uses GPU-accelerated wave-based acoustic simulation for unmatched low-frequency accuracy. AcousPlan uses statistical methods with automated compliance checking and a 5,600-material database. This comparison explains when each approach is the right choice for your acoustic project.
VRASQA Alternative — Acoustic Compliance With a Larger Materials Database
VRASQA offers automated acoustic optimization. AcousPlan offers the same automation plus 5,678 materials (vs VRASQA's limited database), WELL/LEED report generation, and a free tier. Side-by-side comparison.
ISO 3382 Complete Guide: Room Acoustics Measurement and Parameters
ISO 3382 is the international standard for measuring and evaluating room acoustics. Part 1 covers performance spaces, Part 2 covers ordinary rooms, Part 3 covers open plan offices. Here is every parameter, measurement method, and requirement explained — with the specific clause references you need for compliance documentation.