20"

D C 73 dB

C B 70 dB

B A 72 dB

B A 73 dB

C C 73 dB

C C 73 dB

E E 72 dB

C B 73 dB

C A 71 dB

C F 73 dB

B D 69 dB

E E 71 dB

F F 73 dB

F E 73 dB

E E 75 dB

C D 75 dB

C D 72 dB

A B 69 dB

D A 73 dB