C
A
B
A
74 dB
C
A
74 dB
B
A
74 dB
C
A
74 dB
A
A
72 dB
B
C
74 dB
B
A
B
C
A
A
72 dB
C
A
73 dB
C
B
75 dB
C
B
B
A
74 dB
C
B
73 dB
B
A
74 dB
A
A
A
A
A
A
72 dB
B
B
75 dB