D
C
70 dB
C
B
72 dB
C
B
A
B
69 dB
A
B
69 dB
D
C
72 dB
C
B
A
72 dB
B
A
D
A
72 dB
A
B
B
A
72 dB
B
A
B
A
69 dB
B
A