FIGURE A-15
Model 831 with 377C20 Microphone
0
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-8
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FIGURE A-16
Model 831 with 377C20 Microphone
0
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-14
SoundAdvisor Model 831C
Frequency (Hz)
Frequency (Hz)
Mic at n°
20°
60°
100°
140°
180°
Mic at n°
40°
80°
120°
160°
A-26
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