Room Acoustics Simulator
Draw your room, place your speakers and seat, and simulate how it sounds with the same engine as our 3D editor.
A room acoustics simulator predicts how sound behaves in a particular room. This one solves your room’s real shape: below 200 Hz it computes the room’s own modes on a voxel grid, and above 200 Hz it traces rays. You get the frequency response at your seat, the modes that ring longest, RT60 and a 3D view of sound pressure. Your first simulation needs no account; a free account gets 3 a day, and paid plans are unlimited.
Loading the simulator…
How the simulator works
You describe the room in three steps: the floor plan (rectangular, L-shaped or drawn corner by corner), the ceiling, and your speakers and listening seat.
Below 200 Hz the engine divides the room into small voxels and solves for that exact shape’s modes, so an L-shaped room or a sloped ceiling gets modes of its own instead of a shoebox approximation. Above 200 Hz the sound field is treated as diffuse and ray tracing takes over.
The simulation assumes rigid walls, a speed of sound of 343 m/s and standard wall and floor materials. It is a prediction, not a measurement.
What the results show
- The frequency response at your listening seat.
- The room modes that ring longest, ranked.
- RT60 below and above 200 Hz.
- A 3D view of sound pressure you can sweep through frequency, or switch to reflections.
Frequently asked questions
- Is the room acoustics simulator free?
- Yes. Your first simulation needs no account. A free account then gets 3 simulations a day, and any paid plan removes the daily limit. Re-running a room you have already simulated is always free, and simulations never use the 3D editor’s compute credits.
- How is this different from a room mode calculator?
- A room mode calculator uses the closed-form formula for a rectangular box and answers instantly. The simulator solves your drawn room on our servers, so an L-shape, a sloped ceiling and the positions of your speakers and seat all change the result.
- Can it simulate an L-shaped room or a sloped ceiling?
- Yes. Draw the floor plan corner by corner or start from the L-shape, then set the ceiling profile. Below 200 Hz the engine solves the modes of that exact shape rather than approximating it as a box.
- Why does the simulation change method at 200 Hz?
- At low frequencies a small room has a few separate modes whose wavelengths are room-sized, so they need a wave solve. Higher up the modes overlap so densely that the field behaves diffusely, and ray tracing describes the reflections well. The hand-over is fixed at 200 Hz.
- How accurate is the simulation?
- It is a prediction, not a measurement. It assumes rigid walls, a speed of sound of 343 m/s and standard wall and floor materials, so construction and room contents will move a real measurement away from it. It is most useful for comparing rooms, shapes and positions.
- How long does a simulation take?
- It depends on the size of the room and your speaker setup: more channels and more subwoofers take longer. While it runs, the page shows which stage the solver is in.
- Can I add furniture or acoustic treatment?
- Not in the simulator. Open your room in the 3D editor to add furniture, get a treatment plan, find the best speaker and seat positions, and listen to the room.
References
- Kuttruff, H. — Room Acoustics, 6th edition (2016)
- Everest, F. A. — Master Handbook of Acoustics (2015)
- roomtreatment.diy — How our acoustics engine works