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