C
A
70 dB
C
A
70 dB
C
A
70 dB
C
A
C
A
C
A
70 dB
C
B
72 dB
C
A
C
B
D
A
70 dB
D
B
70 dB
D
A
70 dB
B
A
D
C
73 dB
D
C
73 dB