C
A
7 dB
A
B
D
B
7 dB
C
A
A
B
7 dB
D
A
7 dB
D
B
7 dB
C
A
7 dB
C
A
72 dB
B
A
6 dB
B
B
7 dB
A
B
7 dB
D
B
7 dB
D
B
75 dB
D
A
72 dB
C
A
73 dB
A
D
C
7 dB
B
A
A
A
71 dB
C
A
72 dB
C
B
7 dB
D
A
72 dB
B
A
71 dB