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