D A 72 dB

B B 70 dB

A A 72 dB

C A 71 dB

B A 71 dB

C A 71 dB

C B 72 dB

B B 68 dB

A A 71 dB

A C 69 dB

B B 71 dB

A A 72 dB

C A 71 dB

B A 71 dB

B A 71 dB

D A 72 dB

D A 71 dB

C A 72 dB

B A 70 dB