FIGURE A-17
Model 831 with 377C20 Microphone
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FIGURE A-18
Model 831 with 377C20 Microphone
0
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SoundAdvisor Model 831C
Frequency (Hz)
Frequency (Hz)
Mic at n°
10°
50°
90°
130°
170°
Mic at n°
0°
30°
70°
110°
150°
A-22
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