D B 72 dB

C A 70 dB

B B 75 dB

C B 75 dB

A B 74 dB

C C 75 dB

D B 74 dB

B B 75 dB

C A 74 dB

C B 71 dB

C C 75 dB

C C 73 dB

C B 72 dB

C A 70 dB

D B 73 dB

C A 71 dB

C A 70 dB

C A 75 dB

C A 74 dB

B B 75 dB