| n_x | n_y | n_z | Frequency f [Hz] |
|---|
Note: If the lowest problematic frequency exceeds 100 Hz, this typically indicates a small room dimension where the first mode along an axis has half-wavelength too short (L < c/(2·100 Hz) ≈ 1.7 m). In such cases, consider additional mid-bass absorption and diffusion strategies.
Low mode numbers (e.g., n = 1, 2) correspond to low-frequency standing waves with long half-wavelengths. These modes often dominate room resonance and can cause noticeable bass build-up or nulls; acoustic treatment should focus first on controlling these.
High mode numbers (e.g., n ≥ 4) relate to higher-frequency modes where many resonances occur close together. A higher mode density smooths the overall response, making individual resonances less pronounced and the acoustic experience more uniform above the bass region.
In practice, analyze low-order modes to identify problem frequencies and ensure sufficient modal density at higher frequencies for a balanced acoustic response.
Room length, width, height, and mode index limit generate axial, tangential, and oblique mode frequencies. Problematic clusters and treatment hints help identify bass and low-mid resonance issues.