Benchmarks for Room Acoustical Simulation

The Benchmark for Room Acoustical Simulation (BRAS) is a curated set of reference scenes created to make validation and comparison of room-acoustic modeling methods rigorous and reproducible. Each scene comes with carefully specified geometry, boundary conditions and material properties, source and receiver characteristics, and measured transfer functions or impulse responses, so simulators can be tested against known ground truth rather than ad-hoc cases. The collection deliberately mixes “unit-test” style setups that isolate single phenomena (such as a single reflection or scattering case) with more complex rooms, enabling researchers and developers to verify fundamentals before tackling full environments. For further background and full technical details, see the official BRAS documentation and the associated publication by its developers.

At Treble Technologies, we use BRAS as a foundation for validating and demonstrating our simulation methods. Because the dataset spans both simple test cases and realistic room scenarios, it allows us to show not only that our solvers reproduce key acoustic phenomena accurately, but also that they scale to complex environments in line with established benchmarks. By recreating BRAS test cases within our platform, we provide users with transparent comparisons against published references and ensure that our results are traceable to a well-recognized standard in the room-acoustics community. This makes BRAS a natural starting point for exploring the capabilities of our software and for building trust in its predictive accuracy.

You can read more about our recreation of the BRAS cases on the following pages:

Simple reflection from an infinite plane

How well do we model simple reflections?

Diffraction around an infinite edge

Modelling sound diffraction over a large, occluding wall.

Diffraction around a finite object/body

Modelling sound diffraction as a function of occlusion amount.

Multiple diffraction effect

Explore the way we capture the seat-dip effect.

Acoustically coupled rooms

A classic challenge of acoustical simulations, solved with ease.

Small seminar room

Simulating a typical classroom or office space.

Large auditorium

Effortless and accurate simulation of large auditorium.