Room Modes & Standing-Wave Simulator
Rectangular rigid-wall approximation. Useful mainly for low-frequency room behaviour.
Room dimensions
Inspection frequency
Room materials
Avg LF absorption: 11%
Room summary
Nearest mode
(0, 1, 0)
42.88 Hz · Axial
Room volume
54 m³
71 modes below 200 Hz · 0.4 modes/Hz
Estimated reverberation
0.9s
Controlled
Timber floor (joists) · Plaster on concrete / brick
Overall
Moderate acoustics
Mode spectrum by frequency
Each vertical line is one room mode. Tall grouped bars show frequency regions where several modes sit very close together.
What this room may sound like
Moderate acoustics. Noticeable bass colouration. mode stacking at 127, 133, 143 Hz. some notes will boom while others are weak. Sound is well-controlled with natural echo — good clarity for speech and music.
Strengths
- + Ideal RT60 (0.9s)
- + Good speech clarity
Things to watch
- ! 3 region(s) with mode stacking
- ! Low modal density
Key clusters: 126.9 Hz (3 modes); 133.1 Hz (3 modes); 143.5 Hz (3 modes)
Largest gap: 12.0 Hz max (avg 3.4 Hz)
Standing-wave pressure pattern — top view
Zero-crossings are pressure nodes. Strong positive/negative regions are pressure antinodes. The result changes with listener position and source position.
Strongest low-frequency trouble spots
| Frequency | Modes nearby | Likely effect |
|---|---|---|
| 126.9 Hz | 3 | Noticeable reinforcement |
| 133.1 Hz | 3 | Noticeable reinforcement |
| 143.5 Hz | 3 | Noticeable reinforcement |
Modes nearest selected frequency
| nₓ, nᵧ, n_z | Hz | Type | Δf |
|---|---|---|---|
| (0, 1, 0) | 42.88 | Axial | -0.13 |
| (1, 0, 0) | 34.30 | Axial | -8.70 |
| (1, 1, 0) | 54.91 | Tangential | +11.91 |
| (0, 0, 1) | 63.52 | Axial | +20.52 |
| (2, 0, 0) | 68.60 | Axial | +25.60 |
| (1, 0, 1) | 72.19 | Tangential | +29.19 |
| (0, 1, 1) | 76.63 | Tangential | +33.63 |
| (2, 1, 0) | 80.90 | Tangential | +37.90 |
| (1, 1, 1) | 83.96 | Oblique | +40.96 |
| (0, 2, 0) | 85.75 | Axial | +42.75 |
How to interpret it for musical instruments
- Mode peak: a played note near that frequency may become unnaturally loud and may ring longer.
- Mode null: at some positions the same note can become surprisingly weak or almost disappear.
- Closely spaced modes: bass can sound thick, muddy, or uneven because several resonances are excited together.
- Large gaps between modes: nearby notes may lack support, creating a “one note booms, next note dies” effect.
- Instrument consequence: cello, double bass, bass guitar, piano bass, timpani and low male voice reveal these problems most strongly.