C
A
70 dB
A
B
70 dB
C
B
7 dB
A
B
A
B
A
B
7 dB
A
B
6 dB
A
B
C
B
6 dB
A
B
7 dB
A
B
6 dB
D
C
7 dB
C
B
69 dB
B
B
70 dB
B
A
70 dB
C
B
C
B
69 dB
B
A
7 dB
C
B
70 dB
C
B
70 dB
B
B
70 dB
B
A
69 dB
C
A
C
B
70 dB