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+20
61 cm (2 ft.) from sound source
+10
0
–10
EQ
-20
20
50 100
180°
150°
120°
90°
–20 dB
–15 dB
60°
–10 dB
–5 dB
30°
0
250 Hz
500 Hz
1000 Hz
Beta 91A
2
3
4
5
6
7
9 8
2
1000
Hz
150°
150°
120°
120°
90°
90°
60°
60°
30°
30°
3
4
5
6
7
9 8
10000
20000
180°
150°
120°
90°
–20 dB
–15 dB
60°
–10 dB
–5 dB
30°
0
6300 Hz
10000 Hz
20,3 mm (0.8 in.)
21
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