C
A
70 dB
A
B
69 dB
B
A
70 dB
C
A
72 dB
B
A
A
B
69 dB
A
B
C
A
72 dB
B
A
70 dB
C
A
72 dB
C
B
72 dB
C
B
72 dB
C
A
B
A
71 dB
B
A
72 dB
C
B
72 dB
C
B
C
B
72 dB
B
B
69 dB
B
B
71 dB
B
B
B
B
71 dB