C
A
C
A
70 dB
C
A
71 dB
B
A
7 dB
B
A
7 dB
B
A
7 dB
B
A
7 dB
B
A
7 dB
B
A
7 dB
C
A
B
A
7 dB
B
A
7 dB
B
A
B
A
A
A
7 dB
F
C
B
A
C
A
71 dB
B
A
B
A
C
A
71 dB