A
B
70 dB
C
A
69 dB
C
A
69 dB
C
A
68 dB
A
B
68 dB
C
A
A
B
C
A
68 dB
C
A
C
A
68 dB
A
B
68 dB
A
B
70 dB
A
B
68 dB