B
A
71 dB
C
C
72 dB
C
B
71 dB
C
C
72 dB
C
C
72 dB
C
C
72 dB
A
A
72 dB
B
A
72 dB
A
A
7 dB
A
A
B
A
7 dB
A
A
71 dB
A
A
72 dB
A
A
B
B
72 dB
B
A
72 dB
B
A
7 dB
B
B
B
A
A
A
7 dB
B
B
7 dB
B
A
B
B
72 dB