Calculate room modes from room dimensions instantly. Compare axial, tangential, and oblique resonances across ranges. Visualize frequency clusters before treating walls, corners, and ceilings.
This example uses a 6.0 m × 4.2 m × 2.8 m room, 20 °C air temperature, and the standard room-mode equation.
| Mode Type | (nx, ny, nz) | Frequency (Hz) | Note |
|---|---|---|---|
| Axial | (1, 0, 0) | 28.58 | First length mode |
| Axial | (0, 1, 0) | 40.83 | First width mode |
| Axial | (0, 0, 1) | 61.25 | First height mode |
| Tangential | (1, 1, 0) | 49.84 | Length and width combine |
| Tangential | (1, 0, 1) | 67.59 | Length and height combine |
| Tangential | (0, 1, 1) | 73.61 | Width and height combine |
| Oblique | (1, 1, 1) | 78.97 | All three axes combine |
Where:
Mode classification: axial modes use one nonzero index, tangential modes use two, and oblique modes use all three.
Schroeder frequency estimate: fs = 2000 × √(RT60 / V)
Room modes are standing-wave resonances caused by sound reflecting between room boundaries. They create peaks and dips in bass response, making some frequencies louder and others weaker at different listening positions.
Axial modes bounce between two parallel surfaces only, so they lose less energy than tangential and oblique modes. Because of that, they often dominate low-frequency behavior and deserve early attention in treatment planning.
It marks the approximate transition between individual room modes and a denser statistical sound field. Below it, discrete resonances dominate. Above it, modal overlap increases and broadband treatment becomes more influential.
Use a modest value first, such as 6 to 10, for small and medium rooms. Increase it when you need more dense coverage at higher frequencies, but expect longer tables and more clustering.
Sound speed changes with air temperature. That slightly shifts predicted modal frequencies. The difference is not huge for normal rooms, but including temperature makes the calculation more realistic and engineering-friendly.
It shows how many other calculated modes sit within the selected frequency window around each mode. Higher counts can indicate modal clustering, which may produce uneven bass build-up in certain bands.
Not only below it. Low-frequency modes need focused attention, but reflection control, decay management, and broadband absorption above the transition remain important for clarity, imaging, and balanced response.
No. It is a strong planning and design tool, but real rooms include material losses, furniture, openings, and construction details. Measurement microphones and sweeps are still needed for final verification.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.