B
A
72 dB
C
B
73 dB
C
A
7 dB
C
A
72 dB
B
A
7 dB
B
A
72 dB
C
A
D
B
7 dB
B
A
B
A
72 dB
A
B
C
A
72 dB
B
A
72 dB
A
B
7 dB
B