B
A
6 dB
D
B
75 dB
A
B
70 dB
B
B
70 dB
B
A
72 dB
D
D
7 dB
A
A
A
B
7 dB
A
A
70 dB
D
D
75 dB
B
A
72 dB
A
B
7 dB
C
A
7 dB
A
A
A
B
E
B
70 dB
A
B
A
A
C
B
72 dB
A
B
C
A
72 dB
B
A
70 dB
B
B
7 dB