Audio Engineering

Room Acoustics 859

The room (studio) dimensions should therefore be selected to give as even as possible
distribution of the Eigentones. A number of ratios have been formulated that give a
good spread. These are sometimes referred to as golden ratios. Typical values
include:

HW L

1 1 14 1 39

1 1 28 1 54

1 1 60 2 33

::

::

::

..

..

..

Figure 29.8 presents a graphical check method for ensuring an optimal spread of room
resonances.

1m 2m

(a)

(b)

Wall Wall

3m 4m

10dB

10dB

Pressure level

Pressure level

Distance (meters)

Figure 29.7 : Sound pressure level (loudness) variation of fi rst and second modes measured

in a poorly treated control room.