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