B
A
68 dB
B
A
C
B
70 dB
B
A
68 dB
C
B
70 dB
C
B
C
B
69 dB
C
B
70 dB
C
B
69 dB
C
B
C
C
C
C
71 dB
C
C
69 dB
E
B