C
B
69 dB
A
B
69 dB
C
A
70 dB
C
A
70 dB
C
A
B
A
69 dB
B
A
69 dB
B
A
B
A
69 dB
B
A
69 dB
C
A
72 dB
B
D
70 dB
B
A
C
A
72 dB
C
A
C
A
71 dB
B
D
C
A
70 dB
A
B
69 dB
C
A
71 dB
C
B
C
A
C
B
70 dB
A
B