8
English
FIGURE 6. TYPICAL POLAR PATTERNS
125
250
1000
500
2500
5000
10000
15000
30
o
60
o
90
o
150
o
120
o
150
o
120
o
180
o
30
o
60
o
90
o
30
o
60
o
90
o
150
o
120
o
150
o
120
o
180
o
30
o
60
o
90
o
–5 dB
–10 dB
–15 dB
–20 dB
+5 dB
–5 dB
–10 dB
–15 dB
–20 dB
+5 dB
BIDIRECTIONAL RESPONSE GRAPHS
20 200001000 1000050 100
98765432
98765432
+10
0
–10
Hz
dB
15 cm.
60 cm.
FIGURE 8. TYPICAL POLAR PATTERNS
125
250
1000
500
2500
5000
10000
15000
150
o
120
o
150
o
120
o
180
o
30
o
60
o
90
o
30
o
60
o
90
o
30
o
60
o
90
o
150
o
120
o
150
o
120
o
180
o
30
o
60
o
90
o
–5 dB
–10 dB
–15 dB
–20 dB
+5 dB
–5 dB
–10 dB
–15 dB
–20 dB
+5 dB