Stadiums and Outdoor Venues 207Figure 8-6. Behavior in the vertical plane of stacking two 40° vertical by 60° horizontal small mouth horns.
80
60
40 ¾
20 0 20 40 60 80
Vertical polar angleDevice Polar Directivity
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0Relative pressure
80
60
40 ¾
20 0 20 40 60 80
Vertical polar anglePolar Behavior at 500 Hz
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0Relative pressure
80
60
40 ¾
20 0 20 40 60 80
Vertical polar anglePolar Behavior at 1000 Hz
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0Relative pressure
(^80
60
40) ¾
20 0 20 40 60 80
Vertical polar angle
Polar Behavior at 2000 Hz
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
Relative pressure
80
60
40 ¾
20 0 20 40 60 80
Vertical polar angle
Polar Behavior at 4000 Hz
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
Relative pressure
A. Vertical directivity of each device. B. Relative pressure at 500 Hz with d equal to L/2.
C. Relative pressure at 1000 Hz where d = L. D. Relative pressure at 2000 Hz where d = 2L.
E. Relative pressure at 4000 Hz where d = 4L.