19"

A B 69 dB

B A 71 dB

C B 72 dB

A B 70 dB

C A 72 dB

C B 72 dB

C A 71 dB

C B 71 dB

C B 71 dB

C D 73 dB

A A 70 dB

C B 71 dB

B D 69 dB

C C 72 dB

D B 71 dB

C B 70 dB

C C 71 dB

C B 71 dB

C B 72 dB

D B 70 dB

B D 69 dB

A A 70 dB

B A 71 dB