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