PPolySim OS

Room Acoustic Modes

Small rooms fight back at low frequencies. Room modes are standing waves that make bass boom in some spots and vanish in others — see them for your dimensions.

Room Acoustic ModesLive

Controls

Presets

A room resonates at frequencies where sound waves fit exactly between its surfaces. These modes — axial between two walls, tangential among four, oblique among all six — cause the boomy bass and dead spots in small rooms. Even spacing sounds smooth; clustered modes cause problems. Cube-shaped rooms are the worst.

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Data Inspector

Lowest mode34.3 Hz
Modes < 200 Hz67
Volume56 m³

Governing equation

Reading this result: The lowest mode is 34.3 Hz and 67 modes fall below 200 Hz; aim for even spacing between them to avoid boomy peaks and dead spots.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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How it works

A room resonates wherever sound waves fit exactly between its surfaces, producing axial modes between two walls, tangential modes among four, and oblique modes among all six. Evenly spread modes sound smooth; clustered modes create boomy, uneven bass. This is why cube-shaped rooms and studios need careful dimensions and bass trapping.

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Frequently asked questions

Is this room modes calculator tool really free?
Yes. Room Acoustic Modes runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.
Do I need to install anything?
No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.
Can I save or share my simulation?
Create a free account to save projects, and use a shareable embed or minted DOI to publish a live, interactive version anywhere.
How accurate are the results?
The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.