A
B
68 dB
C
A
68 dB
A
B
68 dB
C
A
A
B
68 dB
C
A
A
B
C
A
69 dB
A
B
68 dB
C
A
69 dB
C
A
68 dB
A
B
A
B
68 dB
A
B
A
B
71 dB