Audio Engineering

860 Chapter 29

The frequencies at which main axial room resonances occur can be simply found using
the following formula:

F

n

res L

()



172

,

where L is the room dimension (meters),

n1234,,, etc.

The graph presented in Figure 29.9 provides a quick method of estimating room mode
frequencies.

2.6

2.4

2.2

2.0

1.8

1.6

1.4

1.21.0 1.2 1.4 1.6 1.8 2.0

Width

Length

Acceptable

ratios

Height 1

Figure 29.8 : Preferred room dimension ratios.