Page 232 - The Master Handbook Of Acoustics

207
ABSORPTION OF SOUND

Plywood: 1 /16" 1 /8" 3 /16" 1 /4" 5 /16" /8" 1 /2"
3
60
50

40

30

20 50 Hz
f o = 40 Hz

Depth - inches 10 70 Hz
60 Hz

85 Hz
8 100 Hz

6 125 Hz

5 150 Hz
4 200 Hz
175 Hz

3 250 Hz

2 400 Hz 300 Hz
350 Hz

1
1 2 3 4 6 8 10 20 30
Surface density - Oz/sq. ft.
FIGURE 9-21
Convenient design chart for resonant panel absorbers. (See also Fig. 9-34.)