A
A
6 dB
B
A
72 dB
C
B
72 dB
A
A
C
B
7 dB
B
A
72 dB
C
B
72 dB
C
B
B
A
7 dB
B
A
68 dB
B
A
A
A
B
A
68 dB
A
A
7 dB
B
A
B
A
6 dB
A
A
69 dB
B
A
72 dB
B
A
6 dB
B
B
69 dB
B
B
69 dB