D A 70 dB

A B 72 dB

C A 70 dB

B A 71 dB

D A 70 dB

B A 71 dB

B B 70 dB

D A 70 dB

F C 72 dB

C B 72 dB

C A

C B 72 dB

D A 70 dB

C A 70 dB

C A 71 dB

C A 70 dB

C A 70 dB

C A 71 dB

C A 70 dB

C B 70 dB