C
A
68 dB
A
B
68 dB
A
B
D
A
70 dB
B
71 dB
B
A
C
A
B
A
70 dB
A
B
C
A
70 dB
A
B
68 dB
C
A
68 dB
A
B
68 dB
B
A
70 dB
B
A
70 dB
B
A
70 dB
D
C
71 dB
A
B
B
A
C
A
70 dB
B
A
B
A
B
A
70 dB
D
A
71 dB