Axial modes calculator in a rectangular room
All sizes are given in meters
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Room sizes, m 1 moda 2 moda 3 moda 4 moda
Height: 
69Hz
138Hz
206Hz
275Hz
Width: 
51Hz
101Hz
152Hz
202Hz
Length: 
32Hz
65Hz
97Hz
130Hz
Sound speed: m/s By default с = 344 m/s
Room proportions Room volume Room area
Height:
c.m.
sq.m.
Width
Length:
1. Insert room sizes in the upper left corner of the chart. Please, use full point to separate whole and decimal parts. After the insertion of meanings press “calculate” button.

2. The meanings of the first four room axial modes will be displayed in the chart, on the right from insertion cells. In the diagrams corresponding to the room’s plan and cut, distribution of “zero” room modes will be displayed. Besides, volume, area and apparent room sizes will be calculated automatically.

3. You can optionally change the meaning of sound speed. This might be necessary if you are in mountain area, where the meanings of pressure, humidity and temperature differ from those of normal. By default с = 344 m/s.

4. Amplitude-frequency characteristics at certain frequencies can fail if the listener or acoustic systems are situated along the given lines or on their crossing.

5. In general case, it’s recommended to situate acoustic systems and the listening place in gaps between junction points of modal distribution to get smoother AFR.

6. In diagrams, acoustic systems and the listener’s place are situated at random and are indicated for illustration only.
0 м
5.3 м
0 м
2.5 м
32 Hz
130 Hz
65 Hz
97 Hz
69 Hz
275 Hz
138 Hz
206 Hz
0.66
0.88
1.33
1.99
2.65
3.31
3.98
4.42
4.64
0.31
0.42
0.63
0.94
1.25
1.56
1.88
2.08
2.19
0 м
3.4 м
51 Hz
202 Hz
101 Hz
152 Hz
0.43
0.57
0.85
1.28
1.7
2.13
2.55
2.83
2.98
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