C
B
67 dB
C
A
68 dB
D
A
69 dB
C
A
C
A
70 dB
A
A
D
A
69 dB
C
A
70 dB
A
A
68 dB
C
A
A
C
B
67 dB
C
B
69 dB
C
B
D
A
69 dB