C
A
75 dB
C
B
75 dB
C
A
75 dB
B
B
75 dB
D
B
74 dB
C
A
B
B
6 dB
D
A
71 dB
D
A
71 dB
C
A
C
A
71 dB
A
B
74 dB
D
A
73 dB
C
A
71 dB
C
A
C
C
75 dB
B
B
A
B
B
70 dB
C
A
75 dB
B
B
6 dB
C
A
73 dB
C
A
71 dB