FIGURE A-32
Model 831 with 377C20 Microphone
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FIGURE A-33
Model 831 with 377C20 Microphone
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SoundAdvisor Model 831C
Frequency (Hz)
Frequency (Hz)
Mic at n°
40°
320°
80°
280°
120°
240°
160°
200°
Mic at n°
0°
30°
330°
70°
290°
110°
250°
150°
210°
A-35
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