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